Why does Thunderbird warn me that my server doesn't use encryption?

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class="version"> <option value="version:tb115" data-min="115.0" data-max="116.0" selected> Version 115 </option> <option value="version:tb52" data-min="52.0" data-max="53.0"> Version 52 </option> <option value="version:tb45" data-min="45.0" data-max="46.0"> Version 45 </option> <option value="version:tb38" data-min="38.0" data-max="39.0"> Version 38 </option> <option value="version:tb31" data-min="31.0" data-max="32.0"> Version 31 </option> <option value="version:tb24" data-min="24.0" data-max="25.0"> Version 24 </option> <option value="version:tb17" data-min="17.0" data-max="18.0"> Version 17 </option> </select> </div> <div class="selectbox-wrapper"><select class="platform"> <option value="platform:win8"> Windows 8 </option> <option value="platform:win7"> Windows 7/Vista </option> <option value="platform:winxp"> Windows XP </option> <option value="platform:mac"> Mac </option> <option value="platform:linux"> Linux </option> <option value="platform:win10"> Windows 10 </option> </select> </div> </div> </section></li> </ul></li> </ul> </nav> <div class="document-vote--sidebar-wrap"> </div> </aside> <main role="main" class="sumo-l-two-col--main"> <section id="document-list"> <header class="sumo-article-header kb-header"> <div class="sumo-article-header--text"> <div class="documents-product-title"><a href="https://support-mozilla-org.translate.goog/en-US/products/thunderbird?_x_tr_sl=pl&_x_tr_tl=sl&_x_tr_hl=en-GB" title="Thunderbird"> <img src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/products/2024-02-12-07-36-53-599028_1.png" height="48" width="48" alt=""> </a> </div> <h1 class="sumo-page-heading">Why does Thunderbird warn me that my server doesn't use encryption?</h1> </div> </header> <article class="wiki-doc"> <div id="redirected-from"> (Redirected from <a href="https://support-mozilla-org.translate.goog/en-US/kb/server-dont-use-encryption?redirect=no&_x_tr_sl=pl&_x_tr_tl=sl&_x_tr_hl=en-GB">Why does Thunderbird warn me that my server don't use encryption?</a>) </div> <div class="mzp-c-notification-bar mzp-t-warning"><button class="mzp-c-notification-bar-button" type="button"></button> <div> <p>This article is no longer maintained, so its content might be out of date.</p> </div> </div> <section id="doc-content" class="document--content "> <p>At the end of the "new account" setup, Thunderbird may display a warning like this: <br><br><img alt="mail account setup warning" class="wiki-image frameless lazy" data-original-src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/gallery/images/2011-09-14-00-53-07-65d5a5.png" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/placeholder.688345f843bb37ed.gif" title=""> <br></p> <h1 id="w_what-does-it-mean">What does it mean?</h1> <p>This warning is displayed if you set up a mail server which does not use encryption (such as SSL or TLS) in order to protect your connection. The consequence is that (in theory) all your communication with this server (including login, password transmission and mail transfer) can be intercepted and read by a third party interloper.</p> <p><br></p> <h1 id="w_what-should-i-do">What should I do?</h1> <p>First, you should check if your mail server supports encryption or not. Read its support and help articles in order to determine its connection settings.</p> <ul> <li>If it supports encryption, then you should change the settings in Thunderbird. Click the <span class="button">Change settings</span> button and correct the settings.</li> <li>If it doesn't, then you should consider: <ul> <li>using it at your own risk (check <strong>I understand the risk</strong> and click the <span class="button">Create account</span> button). Please don't hesitate to complain to your mail provider about this lack of security and request that it updates its service to a higher level of security.</li> <li>OR switch to a mail provider which offers a secure connection (such as Gmail, Yahoo,...).</li> </ul></li> </ul> <h1 id="w_see-also">See also</h1> <p><a href="https://translate.google.com/website?sl=pl&tl=sl&hl=en-GB&u=http://en.wikipedia.org/wiki/Transport_Layer_Security">TLS and SSL article on Wikipedia</a></p> </section> <p class="share-link"><br> Share this article: <a href="https://translate.google.com/website?sl=pl&tl=sl&hl=en-GB&u=http://mzl.la/1BsOD6F">http://mzl.la/1BsOD6F</a></p> </article> <section class="sumo-page-section hide-on-large"> </section> <section id="doc-contributors" class="document--contributors sumo-page-section"> <p class="help-title text-body-md">These fine people helped write this article:</p> <div class="document--contributors-list text-body-xs"></div> </section> <section class="sumo-page-section"> <div class="card card--callout is-full-width has-moz-headings"> <div class="card--callout-wrap-narrow"><img class="card--feature-img" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/volunteer.a3be8d331849774b.png" alt="Illustration of hands"> <div class="card--details"> <h3 class="card--title">Volunteer</h3> <p class="card--desc">Grow and share your expertise with others. 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