CINXE.COM

<!DOCTYPE html> <html class="client-nojs vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-disabled skin-theme-clientpref-day vector-toc-available" lang="gl" dir="ltr"> <head> <meta charset="UTF-8"> <title>SMTP - Wikipedia, a enciclopedia libre</title> <script>(function(){var className="client-js vector-feature-language-in-header-enabled vector-feature-language-in-main-page-header-disabled vector-feature-sticky-header-disabled vector-feature-page-tools-pinned-disabled vector-feature-toc-pinned-clientpref-1 vector-feature-main-menu-pinned-disabled vector-feature-limited-width-clientpref-1 vector-feature-limited-width-content-enabled vector-feature-custom-font-size-clientpref-1 vector-feature-appearance-pinned-clientpref-1 vector-feature-night-mode-disabled skin-theme-clientpref-day vector-toc-available";var cookie=document.cookie.match(/(?:^|; )glwikimwclientpreferences=([^;]+)/);if(cookie){cookie[1].split('%2C').forEach(function(pref){className=className.replace(new RegExp('(^| )'+pref.replace(/-clientpref-\w+$|[^\w-]+/g,'')+'-clientpref-\\w+( |$)'),'$1'+pref+'$2');});}document.documentElement.className=className;}());RLCONF={"wgBreakFrames":false,"wgSeparatorTransformTable":[",\t.",".\t,"],"wgDigitTransformTable":["",""], "wgDefaultDateFormat":"dmy","wgMonthNames":["","xaneiro","febreiro","marzo","abril","maio","xuño","xullo","agosto","setembro","outubro","novembro","decembro"],"wgRequestId":"a167d13b-4d66-4e9e-950f-a42a69882d3e","wgCanonicalNamespace":"","wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"SMTP","wgTitle":"SMTP","wgCurRevisionId":6887628,"wgRevisionId":6887628,"wgArticleId":3940,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view","wgUserName":null,"wgUserGroups":["*"],"wgCategories":["Wikipedia:Artigos sen notas ao pé","Wikipedia:Todos os artigos en progreso","Wikipedia:Informática en progreso","Wikipedia:Páxinas que usan ligazóns máxicas RFC","Protocolos de Internet","Redes de computadores","Correo electrónico"],"wgPageViewLanguage":"gl","wgPageContentLanguage":"gl","wgPageContentModel":"wikitext","wgRelevantPageName":"SMTP","wgRelevantArticleId":3940,"wgIsProbablyEditable":true,"wgRelevantPageIsProbablyEditable":true,"wgRestrictionEdit":[], "wgRestrictionMove":[],"wgNoticeProject":"wikipedia","wgCiteReferencePreviewsActive":false,"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgPopupsFlags":0,"wgVisualEditor":{"pageLanguageCode":"gl","pageLanguageDir":"ltr","pageVariantFallbacks":"gl"},"wgMFDisplayWikibaseDescriptions":{"search":true,"watchlist":true,"tagline":true,"nearby":true},"wgWMESchemaEditAttemptStepOversample":false,"wgWMEPageLength":5000,"wgRelatedArticlesCompat":[],"wgCentralAuthMobileDomain":false,"wgEditSubmitButtonLabelPublish":true,"wgULSPosition":"interlanguage","wgULSisCompactLinksEnabled":false,"wgVector2022LanguageInHeader":true,"wgULSisLanguageSelectorEmpty":false,"wgWikibaseItemId":"Q160453","wgCheckUserClientHintsHeadersJsApi":["brands","architecture","bitness","fullVersionList","mobile","model","platform","platformVersion"],"GEHomepageSuggestedEditsEnableTopics":true,"wgGETopicsMatchModeEnabled":false,"wgGEStructuredTaskRejectionReasonTextInputEnabled":false, "wgGELevelingUpEnabledForUser":false};RLSTATE={"ext.gadget.charinsert-styles":"ready","ext.gadget.PortalClass":"ready","ext.globalCssJs.user.styles":"ready","site.styles":"ready","user.styles":"ready","ext.globalCssJs.user":"ready","user":"ready","user.options":"loading","skins.vector.search.codex.styles":"ready","skins.vector.styles":"ready","skins.vector.icons":"ready","jquery.makeCollapsible.styles":"ready","ext.wikimediamessages.styles":"ready","ext.visualEditor.desktopArticleTarget.noscript":"ready","ext.uls.interlanguage":"ready","wikibase.client.init":"ready","ext.wikimediaBadges":"ready"};RLPAGEMODULES=["site","mediawiki.page.ready","jquery.makeCollapsible","mediawiki.toc","skins.vector.js","ext.centralNotice.geoIP","ext.centralNotice.startUp","ext.gadget.ReferenceTooltips","ext.gadget.refToolbar","ext.gadget.charinsert","ext.urlShortener.toolbar","ext.centralauth.centralautologin","mmv.bootstrap","ext.popups","ext.visualEditor.desktopArticleTarget.init", "ext.visualEditor.targetLoader","ext.echo.centralauth","ext.eventLogging","ext.wikimediaEvents","ext.navigationTiming","ext.uls.interface","ext.cx.eventlogging.campaigns","ext.cx.uls.quick.actions","wikibase.client.vector-2022","ext.checkUser.clientHints","ext.growthExperiments.SuggestedEditSession","wikibase.sidebar.tracking"];</script> <script>(RLQ=window.RLQ||[]).push(function(){mw.loader.impl(function(){return["user.options@12s5i",function($,jQuery,require,module){mw.user.tokens.set({"patrolToken":"+\\","watchToken":"+\\","csrfToken":"+\\"}); }];});});</script> <link rel="stylesheet" href="/w/load.php?lang=gl&modules=ext.uls.interlanguage%7Cext.visualEditor.desktopArticleTarget.noscript%7Cext.wikimediaBadges%7Cext.wikimediamessages.styles%7Cjquery.makeCollapsible.styles%7Cskins.vector.icons%2Cstyles%7Cskins.vector.search.codex.styles%7Cwikibase.client.init&only=styles&skin=vector-2022"> <script async="" src="/w/load.php?lang=gl&modules=startup&only=scripts&raw=1&skin=vector-2022"></script> <meta name="ResourceLoaderDynamicStyles" content=""> <link rel="stylesheet" href="/w/load.php?lang=gl&modules=ext.gadget.PortalClass%2Ccharinsert-styles&only=styles&skin=vector-2022"> <link rel="stylesheet" href="/w/load.php?lang=gl&modules=site.styles&only=styles&skin=vector-2022"> <meta name="generator" content="MediaWiki 1.44.0-wmf.4"> <meta name="referrer" content="origin"> <meta name="referrer" content="origin-when-cross-origin"> <meta name="robots" content="noindex,nofollow,max-image-preview:standard"> <meta name="format-detection" content="telephone=no"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/SMTP-transfer-model.svg/1200px-SMTP-transfer-model.svg.png"> <meta property="og:image:width" content="1200"> <meta property="og:image:height" content="716"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/SMTP-transfer-model.svg/800px-SMTP-transfer-model.svg.png"> <meta property="og:image:width" content="800"> <meta property="og:image:height" content="477"> <meta property="og:image" content="https://upload.wikimedia.org/wikipedia/commons/thumb/6/69/SMTP-transfer-model.svg/640px-SMTP-transfer-model.svg.png"> <meta property="og:image:width" content="640"> <meta property="og:image:height" content="382"> <meta name="viewport" content="width=1120"> <meta property="og:title" content="SMTP - Wikipedia, a enciclopedia libre"> <meta property="og:type" content="website"> <link rel="preconnect" href="//upload.wikimedia.org"> <link rel="alternate" media="only screen and (max-width: 640px)" href="//gl.m.wikipedia.org/wiki/SMTP"> <link rel="alternate" type="application/x-wiki" title="Editar" href="/w/index.php?title=SMTP&action=edit"> <link rel="apple-touch-icon" href="/static/apple-touch/wikipedia.png"> <link rel="icon" href="/static/favicon/wikipedia.ico"> <link rel="search" type="application/opensearchdescription+xml" href="/w/rest.php/v1/search" title="Wikipedia (gl)"> <link rel="EditURI" type="application/rsd+xml" href="//gl.wikipedia.org/w/api.php?action=rsd"> <link rel="canonical" href="https://gl.wikipedia.org/wiki/SMTP"> <link rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/deed.gl"> <link rel="alternate" type="application/atom+xml" title="Fonte Atom de novas de Wikipedia" href="/w/index.php?title=Especial:Cambios_recentes&feed=atom"> <link rel="dns-prefetch" href="//meta.wikimedia.org" /> <link rel="dns-prefetch" href="//login.wikimedia.org"> </head> <body class="skin--responsive skin-vector skin-vector-search-vue mediawiki ltr sitedir-ltr mw-hide-empty-elt ns-0 ns-subject mw-editable page-SMTP rootpage-SMTP skin-vector-2022 action-view"><a class="mw-jump-link" href="#bodyContent">Saltar ao contido</a> <div class="vector-header-container"> <header class="vector-header mw-header"> <div class="vector-header-start"> <nav class="vector-main-menu-landmark" aria-label="Sitio"> <div id="vector-main-menu-dropdown" class="vector-dropdown vector-main-menu-dropdown vector-button-flush-left vector-button-flush-right" > <input type="checkbox" id="vector-main-menu-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-main-menu-dropdown" class="vector-dropdown-checkbox " aria-label="Menú principal" > <label id="vector-main-menu-dropdown-label" for="vector-main-menu-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-menu mw-ui-icon-wikimedia-menu"></span> <span class="vector-dropdown-label-text">Menú principal</span> </label> <div class="vector-dropdown-content"> <div id="vector-main-menu-unpinned-container" class="vector-unpinned-container"> <div id="vector-main-menu" class="vector-main-menu vector-pinnable-element"> <div class="vector-pinnable-header vector-main-menu-pinnable-header vector-pinnable-header-unpinned" data-feature-name="main-menu-pinned" data-pinnable-element-id="vector-main-menu" data-pinned-container-id="vector-main-menu-pinned-container" data-unpinned-container-id="vector-main-menu-unpinned-container" > <div class="vector-pinnable-header-label">Menú principal</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-main-menu.pin">mover á barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-main-menu.unpin">agochar</button> </div> <div id="p-navigation" class="vector-menu mw-portlet mw-portlet-navigation" > <div class="vector-menu-heading"> Navegación </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="n-mainpage-description" class="mw-list-item"><a href="/wiki/Portada" title="Visitar a páxina principal [z]" accesskey="z"><span>Portada</span></a></li><li id="n-portal" class="mw-list-item"><a href="/wiki/Wikipedia:Portal_da_comunidade" title="Información acerca do proxecto, do que pode facer e dos lugares onde atopar as cousas"><span>Portal da comunidade</span></a></li><li id="n-A-Taberna" class="mw-list-item"><a href="/wiki/Wikipedia:A_Taberna"><span>A Taberna</span></a></li><li id="n-currentevents" class="mw-list-item"><a href="/wiki/Wikipedia:Actualidade" title="Información acerca de acontecementos de actualidade"><span>Actualidade</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/Especial:Cambios_recentes" title="A lista de modificacións recentes no wiki [r]" accesskey="r"><span>Cambios recentes</span></a></li><li id="n-Artigos-de-calidade" class="mw-list-item"><a href="/wiki/Wikipedia:Artigos_de_calidade"><span>Artigos de calidade</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/Especial:Ao_chou" title="Cargar unha páxina ao chou [x]" accesskey="x"><span>Páxina ao chou</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/Wikipedia:Axuda" title="O lugar para informarse"><span>Axuda</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/Portada" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Wikipedia" src="/static/images/mobile/copyright/wikipedia-wordmark-en.svg" style="width: 7.5em; height: 1.125em;"> <img class="mw-logo-tagline" alt="a Wikipedia en galego" src="/static/images/mobile/copyright/wikipedia-tagline-gl.svg" width="118" height="13" style="width: 7.375em; height: 0.8125em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/Especial:Procurar" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Procurar neste wiki [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Procura</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Procurar en Wikipedia" aria-label="Procurar en Wikipedia" autocapitalize="sentences" title="Procurar neste wiki [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Especial:Procurar"> </div> <button class="cdx-button cdx-search-input__end-button">Procurar</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Ferramentas persoais"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Aparencia"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Cambia a aparencia do tamaño da fonte, o ancho e a cor da páxina" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Aparencia" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Aparencia</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_gl.wikipedia.org&uselang=gl" class=""><span>Doazóns</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Crear_unha_conta&returnto=SMTP&returntoquery=section%3D2%26veaction%3Dedit%26redirect%3Dno" title="É recomendable que cree unha conta e acceda ao sistema, se ben non é obrigatorio" class=""><span>Crear unha conta</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Especial:Iniciar_sesi%C3%B3n&returnto=SMTP&returntoquery=section%3D2%26veaction%3Dedit%26redirect%3Dno" title="É recomendable que se rexistre, se ben non é obrigatorio [o]" accesskey="o" class=""><span>Acceder ao sistema</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Máis opcións" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Ferramentas persoais" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Ferramentas persoais</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Menú de usuario" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_gl.wikipedia.org&uselang=gl"><span>Doazóns</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Crear_unha_conta&returnto=SMTP&returntoquery=section%3D2%26veaction%3Dedit%26redirect%3Dno" title="É recomendable que cree unha conta e acceda ao sistema, se ben non é obrigatorio"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Crear unha conta</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Especial:Iniciar_sesi%C3%B3n&returnto=SMTP&returntoquery=section%3D2%26veaction%3Dedit%26redirect%3Dno" title="É recomendable que se rexistre, se ben non é obrigatorio [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Acceder ao sistema</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Páxinas para os editores sen a sesión iniciada <a href="/wiki/Axuda:Introduci%C3%B3n" aria-label="Máis información sobre a edición"><span>máis información</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Especial:As_mi%C3%B1as_contribuci%C3%B3ns" title="Unha lista das modificacións feitas desde este enderezo IP [y]" accesskey="y"><span>Contribucións</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Especial:A_mi%C3%B1a_conversa" title="Conversa acerca de edicións feitas desde este enderezo IP [n]" accesskey="n"><span>Conversa</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Sitio"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Contidos" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Contidos</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">mover á barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">agochar</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Inicio</div> </a> </li> <li id="toc-Exemplo_dunha_sesión_SMTP" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Exemplo_dunha_sesión_SMTP"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Exemplo dunha sesión SMTP</span> </div> </a> <ul id="toc-Exemplo_dunha_sesión_SMTP-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Seguranza_e_spamming" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Seguranza_e_spamming"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Seguranza e spamming</span> </div> </a> <ul id="toc-Seguranza_e_spamming-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Véxase_tamén" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Véxase_tamén"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Véxase tamén</span> </div> </a> <button aria-controls="toc-Véxase_tamén-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Mostrar ou agochar a subsección "Véxase tamén"</span> </button> <ul id="toc-Véxase_tamén-sublist" class="vector-toc-list"> <li id="toc-Outros_artigos" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Outros_artigos"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Outros artigos</span> </div> </a> <ul id="toc-Outros_artigos-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Ligazóns_externas" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Ligazóns_externas"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Ligazóns externas</span> </div> </a> <ul id="toc-Ligazóns_externas-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contidos" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Mostrar ou agochar a táboa de contidos" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Mostrar ou agochar a táboa de contidos</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">SMTP</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Ir a un artigo noutra lingua. Dispoñible en 59 linguas" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-59" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">59 linguas</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A8%D8%B1%D9%88%D8%AA%D9%88%D9%83%D9%88%D9%84_%D9%86%D9%82%D9%84_%D8%A7%D9%84%D8%A8%D8%B1%D9%8A%D8%AF_%D8%A7%D9%84%D8%A8%D8%B3%D9%8A%D8%B7" title="بروتوكول نقل البريد البسيط – árabe" lang="ar" hreflang="ar" data-title="بروتوكول نقل البريد البسيط" data-language-autonym="العربية" data-language-local-name="árabe" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/SMTP" title="SMTP – acerbaixano" lang="az" hreflang="az" data-title="SMTP" data-language-autonym="Azərbaycanca" data-language-local-name="acerbaixano" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/SMTP" title="SMTP – belaruso" lang="be" hreflang="be" data-title="SMTP" data-language-autonym="Беларуская" data-language-local-name="belaruso" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/SMTP" title="SMTP – búlgaro" lang="bg" hreflang="bg" data-title="SMTP" data-language-autonym="Български" data-language-local-name="búlgaro" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bh mw-list-item"><a href="https://bh.wikipedia.org/wiki/%E0%A4%B8%E0%A4%BF%E0%A4%82%E0%A4%AA%E0%A4%B2_%E0%A4%AE%E0%A5%87%E0%A4%B2_%E0%A4%9F%E0%A5%8D%E0%A4%B0%E0%A4%BE%E0%A4%82%E0%A4%B8%E0%A4%AB%E0%A4%B0_%E0%A4%AA%E0%A5%8D%E0%A4%B0%E0%A5%8B%E0%A4%9F%E0%A5%8B%E0%A4%95%E0%A5%89%E0%A4%B2" title="सिंपल मेल ट्रांसफर प्रोटोकॉल – Bhojpuri" lang="bh" hreflang="bh" data-title="सिंपल मेल ट्रांसफर प्रोटोकॉल" data-language-autonym="भोजपुरी" data-language-local-name="Bhojpuri" class="interlanguage-link-target"><span>भोजपुरी</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – bosníaco" lang="bs" hreflang="bs" data-title="Simple Mail Transfer Protocol" data-language-autonym="Bosanski" data-language-local-name="bosníaco" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – catalán" lang="ca" hreflang="ca" data-title="Simple Mail Transfer Protocol" data-language-autonym="Català" data-language-local-name="catalán" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – checo" lang="cs" hreflang="cs" data-title="Simple Mail Transfer Protocol" data-language-autonym="Čeština" data-language-local-name="checo" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – dinamarqués" lang="da" hreflang="da" data-title="Simple Mail Transfer Protocol" data-language-autonym="Dansk" data-language-local-name="dinamarqués" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – alemán" lang="de" hreflang="de" data-title="Simple Mail Transfer Protocol" data-language-autonym="Deutsch" data-language-local-name="alemán" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/SMTP" title="SMTP – grego" lang="el" hreflang="el" data-title="SMTP" data-language-autonym="Ελληνικά" data-language-local-name="grego" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – inglés" lang="en" hreflang="en" data-title="Simple Mail Transfer Protocol" data-language-autonym="English" data-language-local-name="inglés" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/SMTP" title="SMTP – esperanto" lang="eo" hreflang="eo" data-title="SMTP" data-language-autonym="Esperanto" data-language-local-name="esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Protocolo_para_transferencia_simple_de_correo" title="Protocolo para transferencia simple de correo – español" lang="es" hreflang="es" data-title="Protocolo para transferencia simple de correo" data-language-autonym="Español" data-language-local-name="español" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Lihtne_meiliedastusprotokoll" title="Lihtne meiliedastusprotokoll – estoniano" lang="et" hreflang="et" data-title="Lihtne meiliedastusprotokoll" data-language-autonym="Eesti" data-language-local-name="estoniano" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/SMTP" title="SMTP – éuscaro" lang="eu" hreflang="eu" data-title="SMTP" data-language-autonym="Euskara" data-language-local-name="éuscaro" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%82%D8%B1%D8%A7%D8%B1%D8%AF%D8%A7%D8%AF_%D8%B3%D8%A7%D8%AF%D9%87_%D9%86%D8%A7%D9%85%D9%87%E2%80%8C%D8%B1%D8%B3%D8%A7%D9%86%DB%8C" title="قرارداد ساده نامه‌رسانی – persa" lang="fa" hreflang="fa" data-title="قرارداد ساده نامه‌رسانی" data-language-autonym="فارسی" data-language-local-name="persa" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/SMTP" title="SMTP – finés" lang="fi" hreflang="fi" data-title="SMTP" data-language-autonym="Suomi" data-language-local-name="finés" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – francés" lang="fr" hreflang="fr" data-title="Simple Mail Transfer Protocol" data-language-autonym="Français" data-language-local-name="francés" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – hebreo" lang="he" hreflang="he" data-title="Simple Mail Transfer Protocol" data-language-autonym="עברית" data-language-local-name="hebreo" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%8F%E0%A4%B8%E0%A4%8F%E0%A4%AE%E0%A4%9F%E0%A5%80%E0%A4%AA%E0%A5%80" title="एसएमटीपी – hindi" lang="hi" hreflang="hi" data-title="एसएमटीपी" data-language-autonym="हिन्दी" data-language-local-name="hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/SMTP" title="SMTP – croata" lang="hr" hreflang="hr" data-title="SMTP" data-language-autonym="Hrvatski" data-language-local-name="croata" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – húngaro" lang="hu" hreflang="hu" data-title="Simple Mail Transfer Protocol" data-language-autonym="Magyar" data-language-local-name="húngaro" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/SMTP" title="SMTP – armenio" lang="hy" hreflang="hy" data-title="SMTP" data-language-autonym="Հայերեն" data-language-local-name="armenio" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – indonesio" lang="id" hreflang="id" data-title="Simple Mail Transfer Protocol" data-language-autonym="Bahasa Indonesia" data-language-local-name="indonesio" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/SMTP" title="SMTP – ido" lang="io" hreflang="io" data-title="SMTP" data-language-autonym="Ido" data-language-local-name="ido" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – islandés" lang="is" hreflang="is" data-title="Simple Mail Transfer Protocol" data-language-autonym="Íslenska" data-language-local-name="islandés" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – italiano" lang="it" hreflang="it" data-title="Simple Mail Transfer Protocol" data-language-autonym="Italiano" data-language-local-name="italiano" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – xaponés" lang="ja" hreflang="ja" data-title="Simple Mail Transfer Protocol" data-language-autonym="日本語" data-language-local-name="xaponés" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EA%B0%84%EC%9D%B4_%EC%9A%B0%ED%8E%B8_%EC%A0%84%EC%86%A1_%ED%94%84%EB%A1%9C%ED%86%A0%EC%BD%9C" title="간이 우편 전송 프로토콜 – coreano" lang="ko" hreflang="ko" data-title="간이 우편 전송 프로토콜" data-language-autonym="한국어" data-language-local-name="coreano" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/SMTP" title="SMTP – kurdo" lang="ku" hreflang="ku" data-title="SMTP" data-language-autonym="Kurdî" data-language-local-name="kurdo" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – luxemburgués" lang="lb" hreflang="lb" data-title="Simple Mail Transfer Protocol" data-language-autonym="Lëtzebuergesch" data-language-local-name="luxemburgués" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/SMTP" title="SMTP – lituano" lang="lt" hreflang="lt" data-title="SMTP" data-language-autonym="Lietuvių" data-language-local-name="lituano" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/SMTP" title="SMTP – letón" lang="lv" hreflang="lv" data-title="SMTP" data-language-autonym="Latviešu" data-language-local-name="letón" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mhr mw-list-item"><a href="https://mhr.wikipedia.org/wiki/SMTP" title="SMTP – Eastern Mari" lang="mhr" hreflang="mhr" data-title="SMTP" data-language-autonym="Олык марий" data-language-local-name="Eastern Mari" class="interlanguage-link-target"><span>Олык марий</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/SMTP" title="SMTP – macedonio" lang="mk" hreflang="mk" data-title="SMTP" data-language-autonym="Македонски" data-language-local-name="macedonio" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%B8%E0%B4%BF%E0%B4%AE%E0%B5%8D%E0%B4%AA%E0%B4%BF%E0%B5%BE_%E0%B4%AE%E0%B5%86%E0%B4%AF%E0%B4%BF%E0%B5%BD_%E0%B4%9F%E0%B5%8D%E0%B4%B0%E0%B4%BE%E0%B5%BB%E0%B4%B8%E0%B5%8D%E0%B4%AB%E0%B5%BC_%E0%B4%AA%E0%B5%8D%E0%B4%B0%E0%B5%8B%E0%B4%9F%E0%B5%8D%E0%B4%9F%E0%B5%8B%E0%B4%95%E0%B5%8B%E0%B5%BE" title="സിമ്പിൾ മെയിൽ ട്രാൻസ്ഫർ പ്രോട്ടോകോൾ – malabar" lang="ml" hreflang="ml" data-title="സിമ്പിൾ മെയിൽ ട്രാൻസ്ഫർ പ്രോട്ടോകോൾ" data-language-autonym="മലയാളം" data-language-local-name="malabar" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Protokol_Pindahan_Mel_Mudah" title="Protokol Pindahan Mel Mudah – malaio" lang="ms" hreflang="ms" data-title="Protokol Pindahan Mel Mudah" data-language-autonym="Bahasa Melayu" data-language-local-name="malaio" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – neerlandés" lang="nl" hreflang="nl" data-title="Simple Mail Transfer Protocol" data-language-autonym="Nederlands" data-language-local-name="neerlandés" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – noruegués nynorsk" lang="nn" hreflang="nn" data-title="Simple Mail Transfer Protocol" data-language-autonym="Norsk nynorsk" data-language-local-name="noruegués nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – noruegués bokmål" lang="nb" hreflang="nb" data-title="Simple Mail Transfer Protocol" data-language-autonym="Norsk bokmål" data-language-local-name="noruegués bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – polaco" lang="pl" hreflang="pl" data-title="Simple Mail Transfer Protocol" data-language-autonym="Polski" data-language-local-name="polaco" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – portugués" lang="pt" hreflang="pt" data-title="Simple Mail Transfer Protocol" data-language-autonym="Português" data-language-local-name="portugués" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/SMTP" title="SMTP – romanés" lang="ro" hreflang="ro" data-title="SMTP" data-language-autonym="Română" data-language-local-name="romanés" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/SMTP" title="SMTP – ruso" lang="ru" hreflang="ru" data-title="SMTP" data-language-autonym="Русский" data-language-local-name="ruso" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/SMTP" title="SMTP – serbocroata" lang="sh" hreflang="sh" data-title="SMTP" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="serbocroata" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – Simple English" lang="en-simple" hreflang="en-simple" data-title="Simple Mail Transfer Protocol" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Jednoduch%C3%BD_protokol_na_prenos_po%C5%A1ty" title="Jednoduchý protokol na prenos pošty – eslovaco" lang="sk" hreflang="sk" data-title="Jednoduchý protokol na prenos pošty" data-language-autonym="Slovenčina" data-language-local-name="eslovaco" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/SMTP" title="SMTP – esloveno" lang="sl" hreflang="sl" data-title="SMTP" data-language-autonym="Slovenščina" data-language-local-name="esloveno" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – albanés" lang="sq" hreflang="sq" data-title="Simple Mail Transfer Protocol" data-language-autonym="Shqip" data-language-local-name="albanés" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/SMTP" title="SMTP – serbio" lang="sr" hreflang="sr" data-title="SMTP" data-language-autonym="Српски / srpski" data-language-local-name="serbio" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – sueco" lang="sv" hreflang="sv" data-title="Simple Mail Transfer Protocol" data-language-autonym="Svenska" data-language-local-name="sueco" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%AD%E0%B8%AA%E0%B9%80%E0%B8%AD%E0%B9%87%E0%B8%A1%E0%B8%97%E0%B8%B5%E0%B8%9E%E0%B8%B5" title="เอสเอ็มทีพี – tailandés" lang="th" hreflang="th" data-title="เอสเอ็มทีพี" data-language-autonym="ไทย" data-language-local-name="tailandés" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/SMTP" title="SMTP – turco" lang="tr" hreflang="tr" data-title="SMTP" data-language-autonym="Türkçe" data-language-local-name="turco" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/SMTP" title="SMTP – ucraíno" lang="uk" hreflang="uk" data-title="SMTP" data-language-autonym="Українська" data-language-local-name="ucraíno" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/SMTP" title="SMTP – vietnamita" lang="vi" hreflang="vi" data-title="SMTP" data-language-autonym="Tiếng Việt" data-language-local-name="vietnamita" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-wuu mw-list-item"><a href="https://wuu.wikipedia.org/wiki/%E7%AE%80%E5%8D%95%E9%82%AE%E4%BB%B6%E4%BC%A0%E8%BE%93%E5%8D%8F%E8%AE%AE" title="简单邮件传输协议 – chinés wu" lang="wuu" hreflang="wuu" data-title="简单邮件传输协议" data-language-autonym="吴语" data-language-local-name="chinés wu" class="interlanguage-link-target"><span>吴语</span></a></li><li class="interlanguage-link interwiki-yo mw-list-item"><a href="https://yo.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" title="Simple Mail Transfer Protocol – ioruba" lang="yo" hreflang="yo" data-title="Simple Mail Transfer Protocol" data-language-autonym="Yorùbá" data-language-local-name="ioruba" class="interlanguage-link-target"><span>Yorùbá</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E7%AE%80%E5%8D%95%E9%82%AE%E4%BB%B6%E4%BC%A0%E8%BE%93%E5%8D%8F%E8%AE%AE" title="简单邮件传输协议 – chinés" lang="zh" hreflang="zh" data-title="简单邮件传输协议" data-language-autonym="中文" data-language-local-name="chinés" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q160453#sitelinks-wikipedia" title="Editar as ligazóns interlingüísticas" class="wbc-editpage">Editar as ligazóns</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Espazos de nomes"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/SMTP" title="Ver o contido da páxina [c]" accesskey="c"><span>Artigo</span></a></li><li id="ca-talk" class="vector-tab-noicon mw-list-item"><a href="/wiki/Conversa:SMTP" rel="discussion" title="Conversa acerca do contido desta páxina [t]" accesskey="t"><span>Conversa</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="Cambiar a variante de lingua" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">galego</span> </label> <div class="vector-dropdown-content"> <div id="p-variants" class="vector-menu mw-portlet mw-portlet-variants emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> </div> </div> </nav> </div> <div id="right-navigation" class="vector-collapsible"> <nav aria-label="Vistas"> <div id="p-views" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-views" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-view" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/SMTP"><span>Ler</span></a></li><li id="ca-ve-edit" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=SMTP&veaction=edit" title="Editar esta páxina [v]" accesskey="v"><span>Editar</span></a></li><li id="ca-edit" class="collapsible vector-tab-noicon mw-list-item"><a href="/w/index.php?title=SMTP&action=edit" title="Editar o código fonte desta páxina [e]" accesskey="e"><span>Editar a fonte</span></a></li><li id="ca-history" class="vector-tab-noicon mw-list-item"><a href="/w/index.php?title=SMTP&action=history" title="Versións anteriores desta páxina [h]" accesskey="h"><span>Ver o historial</span></a></li> </ul> </div> </div> </nav> <nav class="vector-page-tools-landmark" aria-label="Ferramentas das páxinas"> <div id="vector-page-tools-dropdown" class="vector-dropdown vector-page-tools-dropdown" > <input type="checkbox" id="vector-page-tools-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-tools-dropdown" class="vector-dropdown-checkbox " aria-label="Ferramentas" > <label id="vector-page-tools-dropdown-label" for="vector-page-tools-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet" aria-hidden="true" ><span class="vector-dropdown-label-text">Ferramentas</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">Ferramentas</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">mover á barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">agochar</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="Máis opcións" > <div class="vector-menu-heading"> Accións </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/SMTP"><span>Ler</span></a></li><li id="ca-more-ve-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=SMTP&veaction=edit" title="Editar esta páxina [v]" accesskey="v"><span>Editar</span></a></li><li id="ca-more-edit" class="collapsible vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=SMTP&action=edit" title="Editar o código fonte desta páxina [e]" accesskey="e"><span>Editar a fonte</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=SMTP&action=history"><span>Ver o historial</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> Xeral </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a href="/wiki/Especial:P%C3%A1xinas_que_ligan_con_esta/SMTP" title="Lista de todas as páxinas do wiki que ligan cara a aquí [j]" accesskey="j"><span>Páxinas que ligan con esta</span></a></li><li id="t-recentchangeslinked" class="mw-list-item"><a href="/wiki/Especial:Cambios_relacionados/SMTP" rel="nofollow" title="Cambios recentes nas páxinas ligadas desde esta [k]" accesskey="k"><span>Cambios relacionados</span></a></li><li id="t-specialpages" class="mw-list-item"><a href="/wiki/Especial:P%C3%A1xinas_especiais" title="Lista de todas as páxinas especiais [q]" accesskey="q"><span>Páxinas especiais</span></a></li><li id="t-permalink" class="mw-list-item"><a href="/w/index.php?title=SMTP&oldid=6887628" title="Ligazón permanente a esta versión desta páxina"><span>Ligazón permanente</span></a></li><li id="t-info" class="mw-list-item"><a href="/w/index.php?title=SMTP&action=info" title="Máis información sobre esta páxina"><span>Información da páxina</span></a></li><li id="t-cite" class="mw-list-item"><a href="/w/index.php?title=Especial:Cita&page=SMTP&id=6887628&wpFormIdentifier=titleform" title="Información sobre como citar esta páxina"><span>Citar esta páxina</span></a></li><li id="t-urlshortener" class="mw-list-item"><a href="/w/index.php?title=Especial:UrlShortener&url=https%3A%2F%2Fgl.wikipedia.org%2Fw%2Findex.php%3Ftitle%3DSMTP%26section%3D2%26veaction%3Dedit"><span>Xerar URL acurtado</span></a></li><li id="t-urlshortener-qrcode" class="mw-list-item"><a href="/w/index.php?title=Especial:QrCode&url=https%3A%2F%2Fgl.wikipedia.org%2Fw%2Findex.php%3Ftitle%3DSMTP%26section%3D2%26veaction%3Dedit"><span>Descargar o código QR</span></a></li> </ul> </div> </div> <div id="p-coll-print_export" class="vector-menu mw-portlet mw-portlet-coll-print_export" > <div class="vector-menu-heading"> Imprimir/exportar </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="coll-create_a_book" class="mw-list-item"><a href="/w/index.php?title=Especial:Libro&bookcmd=book_creator&referer=SMTP"><span>Crear un libro</span></a></li><li id="coll-download-as-rl" class="mw-list-item"><a href="/w/index.php?title=Especial:DownloadAsPdf&page=SMTP&action=show-download-screen"><span>Descargar como PDF</span></a></li><li id="t-print" class="mw-list-item"><a href="/w/index.php?title=SMTP&printable=yes" title="Versión para imprimir da páxina [p]" accesskey="p"><span>Versión para imprimir</span></a></li> </ul> </div> </div> <div id="p-wikibase-otherprojects" class="vector-menu mw-portlet mw-portlet-wikibase-otherprojects" > <div class="vector-menu-heading"> Noutros proxectos </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="wb-otherproject-link wb-otherproject-commons mw-list-item"><a href="https://commons.wikimedia.org/wiki/Category:Simple_Mail_Transfer_Protocol" hreflang="en"><span>Wikimedia Commons</span></a></li><li id="t-wikibase" class="wb-otherproject-link wb-otherproject-wikibase-dataitem mw-list-item"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q160453" title="Ligazón ao elemento conectado no repositorio de datos [g]" accesskey="g"><span>Elemento de Wikidata</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> </div> </div> </div> <div class="vector-column-end"> <div class="vector-sticky-pinned-container"> <nav class="vector-page-tools-landmark" aria-label="Ferramentas das páxinas"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="Aparencia"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">Aparencia</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">mover á barra lateral</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">agochar</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">Na Galipedia, a Wikipedia en galego.</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="gl" dir="ltr"><table class="plainlinks metadata ambox ambox-content" role="presentation"><tbody><tr><td class="mbox-image"><div style="width:52px"><span typeof="mw:File"><a href="/wiki/Wikipedia:Citar_as_fontes" title="Wikipedia:Citar as fontes"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/NoFonti.svg/55px-NoFonti.svg.png" decoding="async" width="55" height="55" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b5/NoFonti.svg/83px-NoFonti.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b5/NoFonti.svg/110px-NoFonti.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">Este artigo contén varias <a href="/wiki/Wikipedia:Ligaz%C3%B3ns_externas" title="Wikipedia:Ligazóns externas">ligazóns externas</a> e/ou bibliografía ao fin da páxina, mais poucas ou ningunha referencia no corpo do texto.<br />Por favor, <b>mellora o artigo introducindo <a href="/wiki/Wikipedia:Gu%C3%ADa/Fontes" title="Wikipedia:Guía/Fontes">notas ao pé</a></b>, <a href="/wiki/Wikipedia:Citar_as_fontes" title="Wikipedia:Citar as fontes">citando as fontes</a>. <div style="font-size:85%;">Podes ver exemplos de como se fai <a href="/wiki/Categor%C3%ADa:Artigos_de_calidade" title="Categoría:Artigos de calidade">nestes artigos</a>.</div></div></td></tr></tbody></table> <table class="infobox" style="width:22em;width:20em;"><tbody><tr><th colspan="2" style="text-align:center;font-size:125%;font-weight:bold;background-color: Lavender; color: black;">SMTP</th></tr><tr><td colspan="2" class="infobox-full-data infobox-data" style="text-align:center;border-bottom: 1px solid ; line-height: 1.5em;"><span typeof="mw:File"><a href="/wiki/Ficheiro:SMTP-transfer-model.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/69/SMTP-transfer-model.svg/250px-SMTP-transfer-model.svg.png" decoding="async" width="250" height="149" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/69/SMTP-transfer-model.svg/375px-SMTP-transfer-model.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/69/SMTP-transfer-model.svg/500px-SMTP-transfer-model.svg.png 2x" data-file-width="1215" data-file-height="725" /></a></span></td></tr><tr><th scope="row" class="infobox-label">Tipo</th><td class="infobox-data">protocolo de rede e Protocolo baseado em texto</td></tr><tr><th scope="row" class="infobox-label">Data de fundación</th><td class="infobox-data"><a href="/wiki/1982" title="1982">1982</a></td></tr><tr><td colspan="2" style="text-align:center;text-align:right;"><span style="font-size:80%;">[ <a href="https://www.wikidata.org/wiki/Q160453" class="extiw" title="d:Q160453">editar datos en Wikidata</a> ]</span></td></tr></tbody></table> <p><b>Simple Mail Transfer Protocol</b> (<b>SMTP</b>, Protocolo de Transferencia Simple de Correo) é o patrón <a href="/wiki/De_facto" title="De facto">de facto</a> para envío de <a href="/wiki/Correo_electr%C3%B3nico" title="Correo electrónico">correo electrónico</a> a través de <a href="/wiki/Internet" title="Internet">Internet</a>. </p><p>SMTP é un protocolo relativamente simple, baseado en texto simple, en que se especifican un ou varios destinatarios dunha mensaxe (e, na maioría dos casos, validados), sendo despois a mensaxe transferida. É bastante fácil testar un servidor SMTP usando o programa <a href="/wiki/Telnet" title="Telnet">telnet</a>. Este protocolo corre sobre o porta 25 nunha rede <a href="/wiki/TCP" title="TCP">TCP</a>. A resolución <a href="/wiki/DNS" class="mw-redirect" title="DNS">DNS</a> dun servidor SMTP dun dado dominio posibilítase pola entrada <a href="/w/index.php?title=MX&action=edit&redlink=1" class="new" title="MX (a páxina aínda non existe)">MX</a> (<i>Mail eXchange</i>). </p><p>A utilización en masa do SMTP remonta aos <a href="/wiki/Anos_80" class="mw-redirect" title="Anos 80">anos 80</a>. Na altura era un complemento ao <a href="/w/index.php?title=UUCP&action=edit&redlink=1" class="new" title="UUCP (a páxina aínda non existe)">UUCP</a> que estaba mellor adecuado para transferencias de <a href="/wiki/Correo_electr%C3%B3nico" title="Correo electrónico">correo electrónico</a> entre máquinas sen ligazón permanente. Por outro lado, o desempeño do SMTP aumenta se as máquinas envolvidas, emisor e receptor, se atoparen ligadas permanentemente. </p><p>O <a href="/w/index.php?title=Sendmail&action=edit&redlink=1" class="new" title="Sendmail (a páxina aínda non existe)">Sendmail</a> foi un dos primeiros (se non o primeiro) <a href="/w/index.php?title=Mail_transfer_agent&action=edit&redlink=1" class="new" title="Mail transfer agent (a páxina aínda non existe)">axente de transporte de correo electrónico</a> a implementar SMTP. En <a href="/wiki/2001" title="2001">2001</a> existían, polo menos, uns 50 programas que implementan SMTP como cliente (emisor) ou servidor (receptor). Outros servidores SMTP moi coñecidos son: <a href="/w/index.php?title=Ex%C3%ADn&action=edit&redlink=1" class="new" title="Exín (a páxina aínda non existe)">exín</a>, <a href="/w/index.php?title=Postfix_(software)&action=edit&redlink=1" class="new" title="Postfix (software) (a páxina aínda non existe)">Postfix</a>, <a href="/w/index.php?title=Qmail&action=edit&redlink=1" class="new" title="Qmail (a páxina aínda non existe)">Qmail</a>, e <a href="/w/index.php?title=Microsoft_Exchange_Server&action=edit&redlink=1" class="new" title="Microsoft Exchange Server (a páxina aínda non existe)">Microsoft Exchange Server</a>. </p><p>Dada a especificación inicial, que contemplaba apenas texto <a href="/w/index.php?title=ACII&action=edit&redlink=1" class="new" title="ACII (a páxina aínda non existe)">ACII</a>, este protocolo non é ideal para a transferencia de ficheiros. Algúns <a href="/w/index.php?title=Est%C3%A1ndar&action=edit&redlink=1" class="new" title="Estándar (a páxina aínda non existe)">estándars</a> foron desenvolvidos para permitir a transferencia de ficheiros en formato binario a través de texto simple, como o caso do <a href="/wiki/MIME" title="MIME">MIME</a>. Hoxe en día case todos os servidores SMTP soportan a extensión 8BITMIME. </p><p>O SMTP é un protocolo de recepción apenas, i.e., non permite que un usuario descargue as mensaxes dun servidor. Para iso é necesario un <a href="/w/index.php?title=Cliente_de_correo_electr%C3%B3nico&action=edit&redlink=1" class="new" title="Cliente de correo electrónico (a páxina aínda non existe)">cliente de correo electrónico</a> que soporte <a href="/wiki/POP3" title="POP3">POP3</a> ou <a href="/wiki/IMAP" title="IMAP">IMAP</a>, que é o caso da maioría dos clientes actuais. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Exemplo_dunha_sesión_SMTP"><span id="Exemplo_dunha_sesi.C3.B3n_SMTP"></span>Exemplo dunha sesión SMTP</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=SMTP&veaction=edit&section=1" title="Editar a sección: «Exemplo dunha sesión SMTP»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=SMTP&action=edit&section=1" title="Editar o código fonte da sección: Exemplo dunha sesión SMTP"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Despois do estabelecemento dunha <a href="/w/index.php?title=Conexi%C3%B3n&action=edit&redlink=1" class="new" title="Conexión (a páxina aínda non existe)">conexión</a> entre emisor (<a href="/w/index.php?title=Cliente&action=edit&redlink=1" class="new" title="Cliente (a páxina aínda non existe)">cliente</a>) e receptor (<a href="/wiki/Servidor" title="Servidor">servidor</a>), o exemplo seguinte ilustra unha sesión SMTP. Na conversación seguinte, "C:" designa as mensaxes do cliente e "S:" as mensaxes do servidor. Na maioría dos computadores unha <a href="/w/index.php?title=Conexi%C3%B3n&action=edit&redlink=1" class="new" title="Conexión (a páxina aínda non existe)">conexión</a> pode ser estabelecida usando o comando <a href="/wiki/Telnet" title="Telnet">telnet</a> no emisor, por exemplo: </p> <pre>telnet www.example.com 25 </pre> <p>que irá abrir unha ligazón SMTP entre a máquina cliente (emisor) e o servidor www.example.com. </p> <pre>S: 220 www.example.com ESMTP Postfix C: HELO mydomain.com S: 250 Hello mydomain.com C: MAIL FROM: sender@mydomain.com S: 250 Ok C: RCPT TO: friend@example.com S: 250 Ok C: DATA S: 354 End data with <CR><LF>.<CR><LF> C: Subject: test mesaxe C: From: sender@mydomain.com C: To: friend@example.com C: C: Hello, C: This is a test. C: Goodbye. C: . S: 250 Ok: queued as 12345 C: quit S: 221 Bye </pre> <p>Aínda que opcional, practicamente todos os clientes pregúntanlle ao servidor cales extensións SMTP soporta, utilizando o comando <i>EHLO</i> (en oposición ao <i>HELO</i> ilustrado enriba), e o corpo da mensaxe (a seguir a <i>DATA</i>) segue tipicamente en formato <a href="/wiki/MIME" title="MIME">MIME</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Seguranza_e_spamming">Seguranza e spamming</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=SMTP&veaction=edit&section=2" title="Editar a sección: «Seguranza e spamming»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=SMTP&action=edit&section=2" title="Editar o código fonte da sección: Seguranza e spamming"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Unha das limitacións da especificación SMTP inicial é que non existe método de autenticación dos emisores. Como tal, foille engadida a extensión <a href="/w/index.php?title=SMTP-AUTH&action=edit&redlink=1" class="new" title="SMTP-AUTH (a páxina aínda non existe)">SMTP-AUTH</a>. </p><p>A pesar diso, o <a href="/w/index.php?title=Spamming&action=edit&redlink=1" class="new" title="Spamming (a páxina aínda non existe)">spamming</a> continuaba a ser un problema. Alterar o SMTP extensivamente ou substituílo completamente non se torna práctico, debido á forte utilización do SMTP e aos efectos que de aí podían advir. O <a href="/w/index.php?title=Internet_Mail_2000&action=edit&redlink=1" class="new" title="Internet Mail 2000 (a páxina aínda non existe)">Internet Mail 2000</a> é unha proposta nese sentido. </p><p>É por esta razón que existen varias propostas para protocolos alternativos que irían asistir a operación SMTP. O <a href="/w/index.php?title=Anti-Spam_Research_Group&action=edit&redlink=1" class="new" title="Anti-Spam Research Group (a páxina aínda non existe)">Grupo de Investigación Anti-Spam</a> do <a href="/w/index.php?title=IRTF&action=edit&redlink=1" class="new" title="IRTF (a páxina aínda non existe)">IRTF</a> atópase a estudar varias propostas para se soportar a autenticación do emisor dunha forma flexíbel e escalábel. A proposta aparentemente máis sólida parece ser o protocolo <a href="/w/index.php?title=Sender_Policy_Framework&action=edit&redlink=1" class="new" title="Sender Policy Framework (a páxina aínda non existe)">Sender Policy Framework</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Véxase_tamén"><span id="V.C3.A9xase_tam.C3.A9n"></span>Véxase tamén</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=SMTP&veaction=edit&section=3" title="Editar a sección: «Véxase tamén»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=SMTP&action=edit&section=3" title="Editar o código fonte da sección: Véxase tamén"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Outros_artigos">Outros artigos</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=SMTP&veaction=edit&section=4" title="Editar a sección: «Outros artigos»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=SMTP&action=edit&section=4" title="Editar o código fonte da sección: Outros artigos"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Post_Office_Protocol" class="mw-redirect" title="Post Office Protocol">Post Office Protocol</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="Ligazóns_externas"><span id="Ligaz.C3.B3ns_externas"></span>Ligazóns externas</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=SMTP&veaction=edit&section=5" title="Editar a sección: «Ligazóns externas»" class="mw-editsection-visualeditor"><span>editar</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=SMTP&action=edit&section=5" title="Editar o código fonte da sección: Ligazóns externas"><span>editar a fonte</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20051217052655/http://www.ietf.org/rfc/rfc2821.txt">RFC 2821</a> - <i>The Simple Mail Transfer Protocol</i>, que tornou obsoleto o <a class="external mw-magiclink-rfc" rel="nofollow" href="https://tools.ietf.org/html/rfc821">RFC 821</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20051217052040/http://www.ietf.org/rfc/rfc2822.txt">RFC 2822</a> - <i>Internet (i.e. e-mail) Mesaxe Format</i>, que tornou obsoleto o <a class="external mw-magiclink-rfc" rel="nofollow" href="https://tools.ietf.org/html/rfc821">RFC 821</a></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20051214010933/http://www.ietf.org/rfc/rfc1869.txt">RFC 1869</a> - Extensións do SMTP, orixinando o <i><a href="/w/index.php?title=ESMTP&action=edit&redlink=1" class="new" title="ESMTP (a páxina aínda non existe)">Extended SMTP</a></i></li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20051217052655/http://www.ietf.org/rfc/rfc2821.txt">RFC 1891</a> - Extensión ao SMTP para soportar <i>Delivery Status Notification (DSN)</i></li></ul> <div role="navigation" class="navbox" aria-labelledby="Protocolos_de_Internet" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div class="plainlinks hlist navbar mini"><ul><li class="nv-ver"><a href="/wiki/Modelo:Protocolos_de_Internet" title="Modelo:Protocolos de Internet"><abbr title="Ver o modelo">v</abbr></a></li><li class="nv-conversa"><a href="/w/index.php?title=Conversa_modelo:Protocolos_de_Internet&action=edit&redlink=1" class="new" title="Conversa modelo:Protocolos de Internet (a páxina aínda non existe)"><abbr title="Conversa do modelo">c</abbr></a></li><li class="nv-editar"><a class="external text" href="https://gl.wikipedia.org/w/index.php?title=Modelo:Protocolos_de_Internet&action=edit"><abbr title="Editar o modelo">e</abbr></a></li></ul></div><div id="Protocolos_de_Internet" style="font-size:114%;margin:0 4em"><a href="/wiki/Protocolo_de_Internet" title="Protocolo de Internet">Protocolos de Internet</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Modelo_OSI" title="Modelo OSI">Capa de Aplicación</a></th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/HTTP" title="HTTP">HTTP</a></li> <li><a href="/wiki/Hypertext_Transfer_Protocol_Secure" title="Hypertext Transfer Protocol Secure">HTTPS</a></li> <li><a class="mw-selflink selflink">SMTP</a></li> <li><a href="/wiki/FTP" class="mw-redirect" title="FTP">FTP</a></li> <li><a href="/wiki/SSH" title="SSH">SSH</a></li> <li><a href="/wiki/SNMP" title="SNMP">SNMP</a></li> <li><a href="/wiki/IRC" title="IRC">IRC</a></li> <li><a href="/w/index.php?title=NNTP&action=edit&redlink=1" class="new" title="NNTP (a páxina aínda non existe)">NNTP</a></li> <li><a href="/wiki/POP3" title="POP3">POP3</a></li> <li><a href="/wiki/IMAP" title="IMAP">IMAP</a></li> <li><a href="/wiki/Telnet" title="Telnet">Telnet</a></li> <li><a href="/wiki/BitTorrent" title="BitTorrent">BitTorrent</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Modelo_OSI" title="Modelo OSI">Capa de Transporte</a></th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/TCP" title="TCP">TCP</a></li> <li><a href="/wiki/UDP" title="UDP">UDP</a></li> <li><a href="/w/index.php?title=SCTP&action=edit&redlink=1" class="new" title="SCTP (a páxina aínda non existe)">SCTP</a></li> <li><a href="/w/index.php?title=Real-time_Transport_Protocol&action=edit&redlink=1" class="new" title="Real-time Transport Protocol (a páxina aínda non existe)">RTP</a></li> <li><a href="/w/index.php?title=Datagram_Congestion_Control_Protocol&action=edit&redlink=1" class="new" title="Datagram Congestion Control Protocol (a páxina aínda non existe)">DCCP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Modelo_OSI" title="Modelo OSI">Capa de Rede</a></th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Protocolo_IPv4" title="Protocolo IPv4">IPv4</a></li> <li><a href="/wiki/Protocolo_IPv6" title="Protocolo IPv6">IPv6</a></li> <li><a href="/wiki/Address_Resolution_Protocol" title="Address Resolution Protocol">ARP</a></li> <li><a href="/wiki/ICMP" title="ICMP">ICMP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Modelo_OSI" title="Modelo OSI">Capa de Ligazón</a></th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Ethernet" title="Ethernet">Ethernet</a></li> <li><a href="/wiki/IEEE_802.11" title="IEEE 802.11">802.11 WiFi</a></li> <li><a href="/w/index.php?title=Token_ring&action=edit&redlink=1" class="new" title="Token ring (a páxina aínda non existe)">Token ring</a></li> <li><a href="/w/index.php?title=Fiber_distributed_data_interface&action=edit&redlink=1" class="new" title="Fiber distributed data interface (a páxina aínda non existe)">FDDI</a></li> <li><a href="/wiki/PPP" title="PPP">PPP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Modelo_OSI" title="Modelo OSI">Capa Física</a></th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/w/index.php?title=RS-232&action=edit&redlink=1" class="new" title="RS-232 (a páxina aínda non existe)">RS-232</a></li> <li><a href="/w/index.php?title=EIA-422&action=edit&redlink=1" class="new" title="EIA-422 (a páxina aínda non existe)">EIA-422</a></li> <li><a href="/w/index.php?title=RS-449&action=edit&redlink=1" class="new" title="RS-449 (a páxina aínda non existe)">RS-449</a></li> <li><a href="/w/index.php?title=EIA-485&action=edit&redlink=1" class="new" title="EIA-485 (a páxina aínda non existe)">EIA-485</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><a href="/wiki/Categor%C3%ADa:Protocolos_de_Internet" title="Categoría:Protocolos de Internet">Categoría</a></div></td></tr></tbody></table></div> <div role="navigation" class="navbox" aria-labelledby="Control_de_autoridades" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th id="Control_de_autoridades" scope="row" class="navbox-group" style="width:1%;width: 12%; text-align:center;"><a href="/wiki/Axuda:Control_de_autoridades" title="Axuda:Control de autoridades">Control de autoridades</a></th><td class="navbox-list navbox-odd plainlinks" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><span style="white-space:nowrap;"><span typeof="mw:File"><a href="https://www.wikidata.org/wiki/Wikidata:Main_Page" title="Wikidata"><img alt="Wd" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/20px-Wikidata-logo.svg.png" decoding="async" width="20" height="11" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/30px-Wikidata-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/40px-Wikidata-logo.svg.png 2x" data-file-width="1050" data-file-height="590" /></a></span>: <span class="uid"><a href="https://www.wikidata.org/wiki/Q160453" class="extiw" title="wikidata:Q160453">Q160453</a></span></span></li> <li><span style="white-space:nowrap;">MAG: <span class="uid"><span class="plainlinks"><a rel="nofollow" class="external text" href="https://web.archive.org/web/*/https://academic.microsoft.com/v2/detail/2779968404">2779968404</a></span></span></span></li></ul> </div></td></tr></tbody></table></div> <hr /> <table> <tbody><tr> <td><span typeof="mw:File"><span title="Este artigo tan só é un bosquexo"><img alt="Este artigo tan só é un bosquexo" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/77/Computer_n_screen.svg/30px-Computer_n_screen.svg.png" decoding="async" width="30" height="31" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/77/Computer_n_screen.svg/45px-Computer_n_screen.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/77/Computer_n_screen.svg/60px-Computer_n_screen.svg.png 2x" data-file-width="119" data-file-height="123" /></span></span> </td> <td><div style="line-height: 110%;"> <span style="font-size:95%"><i>Este artigo sobre <a href="/wiki/Inform%C3%A1tica" title="Informática">informática</a> é, polo de agora, só un bosquexo. <span class="plainlinks"><a class="external text" href="https://gl.wikipedia.org/w/index.php?title=SMTP&action=edit">Traballa nel</a></span> para axudar a contribuír a que a Galipedia <a href="/wiki/Wikipedia:Mantemento" title="Wikipedia:Mantemento">mellore e medre</a>.</i></span><br /> <i><span style="font-size:85%">Existen igualmente outros <a href="/wiki/Categor%C3%ADa:Wikipedia:Inform%C3%A1tica_en_progreso" title="Categoría:Wikipedia:Informática en progreso">artigos relacionados con este tema</a> nos que tamén podes contribuír.</span></i></div> </td></tr></tbody></table> <hr />    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Traído desde «<a dir="ltr" href="https://gl.wikipedia.org/w/index.php?title=SMTP&oldid=6887628">https://gl.wikipedia.org/w/index.php?title=SMTP&oldid=6887628</a>»</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Especial:Categor%C3%ADas" title="Especial:Categorías">Categorías</a>: <ul><li><a href="/wiki/Categor%C3%ADa:Protocolos_de_Internet" title="Categoría:Protocolos de Internet">Protocolos de Internet</a></li><li><a href="/wiki/Categor%C3%ADa:Redes_de_computadores" title="Categoría:Redes de computadores">Redes de computadores</a></li><li><a href="/wiki/Categor%C3%ADa:Correo_electr%C3%B3nico" title="Categoría:Correo electrónico">Correo electrónico</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Categorías agochadas: <ul><li><a href="/wiki/Categor%C3%ADa:Wikipedia:Artigos_sen_notas_ao_p%C3%A9" title="Categoría:Wikipedia:Artigos sen notas ao pé">Wikipedia:Artigos sen notas ao pé</a></li><li><a href="/wiki/Categor%C3%ADa:Wikipedia:Todos_os_artigos_en_progreso" title="Categoría:Wikipedia:Todos os artigos en progreso">Wikipedia:Todos os artigos en progreso</a></li><li><a href="/wiki/Categor%C3%ADa:Wikipedia:Inform%C3%A1tica_en_progreso" title="Categoría:Wikipedia:Informática en progreso">Wikipedia:Informática en progreso</a></li><li><a href="/wiki/Categor%C3%ADa:Wikipedia:P%C3%A1xinas_que_usan_ligaz%C3%B3ns_m%C3%A1xicas_RFC" title="Categoría:Wikipedia:Páxinas que usan ligazóns máxicas RFC">Wikipedia:Páxinas que usan ligazóns máxicas RFC</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> A última edición desta páxina foi o 15 de novembro de 2024 ás 11:22.</li> <li id="footer-info-copyright">Todo o texto está dispoñible baixo a <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/">licenza Creative Commons recoñecemento compartir igual 4.0</a>; pódense aplicar termos adicionais. Consulte os <a class="external text" href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Terms_of_Use/gl">termos de uso</a> para obter máis información.<br />Wikipedia® é unha marca rexistrada da <a rel="nofollow" class="external text" href="https://www.wikimediafoundation.org/">Wikimedia Foundation, Inc.</a>, unha organización sen fins lucrativos.<br /></li> </ul> <ul id="footer-places"> <li id="footer-places-privacy"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Privacy_policy">Normas de protección de datos</a></li> <li id="footer-places-about"><a href="/wiki/Wikipedia:Acerca_de">Acerca de Wikipedia</a></li> <li id="footer-places-disclaimers"><a href="/wiki/Wikipedia:Advertencia_xeral">Advertencias</a></li> <li id="footer-places-wm-codeofconduct"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Universal_Code_of_Conduct">Código de conduta</a></li> <li id="footer-places-developers"><a href="https://developer.wikimedia.org">Desenvolvedores</a></li> <li id="footer-places-statslink"><a href="https://stats.wikimedia.org/#/gl.wikipedia.org">Estatísticas</a></li> <li id="footer-places-cookiestatement"><a href="https://foundation.wikimedia.org/wiki/Special:MyLanguage/Policy:Cookie_statement">Declaración de cookies</a></li> <li id="footer-places-mobileview"><a href="//gl.m.wikipedia.org/w/index.php?title=SMTP&section=2&veaction=edit&mobileaction=toggle_view_mobile" class="noprint stopMobileRedirectToggle">Vista móbil</a></li> </ul> <ul id="footer-icons" class="noprint"> <li id="footer-copyrightico"><a href="https://wikimediafoundation.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/static/images/footer/wikimedia-button.svg" width="84" height="29" alt="Wikimedia Foundation" loading="lazy"></a></li> <li id="footer-poweredbyico"><a href="https://www.mediawiki.org/" class="cdx-button cdx-button--fake-button cdx-button--size-large cdx-button--fake-button--enabled"><img src="/w/resources/assets/poweredby_mediawiki.svg" alt="Powered by MediaWiki" width="88" height="31" loading="lazy"></a></li> </ul> </footer> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> </div><script>(RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgHostname":"mw-web.codfw.main-6df7948d6c-ccpzx","wgBackendResponseTime":170,"wgPageParseReport":{"limitreport":{"cputime":"1.131","walltime":"1.392","ppvisitednodes":{"value":13191,"limit":1000000},"postexpandincludesize":{"value":27243,"limit":2097152},"templateargumentsize":{"value":4928,"limit":2097152},"expansiondepth":{"value":24,"limit":100},"expensivefunctioncount":{"value":1,"limit":500},"unstrip-depth":{"value":0,"limit":20},"unstrip-size":{"value":0,"limit":5000000},"entityaccesscount":{"value":2,"limit":400},"timingprofile":["100.00% 1266.540 1 -total"," 91.24% 1155.581 1 Modelo:Organización"," 90.79% 1149.858 1 Modelo:Infobox"," 70.81% 896.858 108 Modelo:Propiedade"," 62.47% 791.203 74 Modelo:Str_find"," 8.72% 110.442 2 Modelo:Redes_sociais"," 5.23% 66.186 1 Modelo:Control_de_autoridades"," 2.30% 29.182 1 Modelo:Sen_notas"," 2.07% 26.248 1 Modelo:Ambox"," 0.76% 9.625 1 Modelo:Protocolos_de_Internet"]},"scribunto":{"limitreport-timeusage":{"value":"0.883","limit":"10.000"},"limitreport-memusage":{"value":3694601,"limit":52428800}},"cachereport":{"origin":"mw-web.codfw.main-6df7948d6c-4krnq","timestamp":"20241127165850","ttl":2592000,"transientcontent":false}}});});</script> <script type="application/ld+json">{"@context":"https:\/\/schema.org","@type":"Article","name":"SMTP","url":"https:\/\/gl.wikipedia.org\/wiki\/SMTP","sameAs":"http:\/\/www.wikidata.org\/entity\/Q160453","mainEntity":"http:\/\/www.wikidata.org\/entity\/Q160453","author":{"@type":"Organization","name":"Colaboradores dos proxectos da Wikimedia"},"publisher":{"@type":"Organization","name":"Wikimedia Foundation, Inc.","logo":{"@type":"ImageObject","url":"https:\/\/www.wikimedia.org\/static\/images\/wmf-hor-googpub.png"}},"datePublished":"2004-11-19T23:20:43Z","dateModified":"2024-11-15T11:22:14Z","image":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/6\/69\/SMTP-transfer-model.svg"}</script> </body> </html>