About Rspamd

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</li> <li class="r-docs-subnav list-group-item"> <a href="/doc/configuration/">Rspamd configuration</a> <ul> <li><a href="/doc/configuration/metrics.html">Actions and scores</a></li> <li><a href="/doc/configuration/options.html">Common options</a></li> <li><a href="/doc/configuration/composites.html">Composite symbols</a></li> <li><a href="/doc/configuration/logging.html">Logging settings</a></li> <li><a href="/doc/configuration/redis.html">Redis configuration</a></li> <li><a href="/doc/configuration/maps.html">Rspamd maps</a></li> <li><a href="/doc/configuration/selectors.html">Selectors</a></li> <li><a href="/doc/configuration/statistic.html">Statistics settings</a></li> <li><a href="/doc/configuration/ucl.html">Universal configuration language (UCL)</a></li> <li><a href="/doc/configuration/upstream.html">Upstreams configuration</a></li> <li><a href="/doc/configuration/settings.html">User settings</a></li> </ul> </li> <li class="r-docs-subnav list-group-item"> <a href="/doc/modules/">Modules documentation</a> <ul> <li><a href="/doc/modules/antivirus.html"><strong>Antivirus module</strong></a></li> <li><a href="/doc/modules/arc.html">ARC module</a></li> <li><a href="/doc/modules/asn.html">ASN module</a></li> <li><a href="/doc/modules/bayes_expiry.html">Bayes expiry module</a></li> <li><a href="/doc/modules/chartable.html">Chartable module</a></li> <li><a href="/doc/modules/clickhouse.html"><strong>Clickhouse module</strong></a></li> <li><a href="/doc/modules/dcc.html">DCC module</a></li> <li><a href="/doc/modules/dkim.html">DKIM module</a></li> <li><a href="/doc/modules/dkim_signing.html">DKIM signing module</a></li> <li><a href="/doc/modules/dmarc.html">DMARC module</a></li> <li><a href="/doc/modules/elastic.html">Elasticsearch module</a></li> <li><a href="/doc/modules/emails.html"><del>Emails module</del></a></li> <li><a href="/doc/modules/external_relay.html">External Relay module</a></li> <li><a href="/doc/modules/external_services.html"><strong>External Services module</strong></a></li> <li><a href="/doc/modules/force_actions.html"><strong>Force Actions module</strong></a></li> <li><a href="/doc/modules/fuzzy_check.html">Fuzzy check module</a></li> <li><a href="/doc/modules/gpt.html">GPT Plugin</a></li> <li><a href="/doc/modules/greylisting.html">Greylisting module</a></li> <li><a href="/doc/modules/hfilter.html">Hfilter module</a></li> <li><a href="/doc/modules/ip_score.html"><del>IP Score module</del></a></li> <li><a href="/doc/modules/known_senders.html">known_senders module</a></li> <li><a href="/doc/modules/maillist.html">Mailing lists module</a></li> <li><a href="/doc/modules/metadata_exporter.html">Metadata exporter</a></li> <li><a href="/doc/modules/metric_exporter.html">Metric exporter</a></li> <li><a href="/doc/modules/mid.html">MID module</a></li> <li><a href="/doc/modules/milter_headers.html"><strong>Milter headers module</strong></a></li> <li><a href="/doc/modules/mime_types.html">Mime types modules</a></li> <li><a href="/doc/modules/multimap.html"><strong>Multimap module</strong></a></li> <li><a href="/doc/modules/mx_check.html">MX Check module</a></li> <li><a href="/doc/modules/neural.html">Neural network module</a></li> <li><a href="/doc/modules/once_received.html">Once received module</a></li> <li><a href="/doc/modules/phishing.html">Phishing module</a></li> <li><a href="/doc/modules/ratelimit.html"><strong>Ratelimit module</strong></a></li> <li><a href="/doc/modules/rbl.html"><strong>RBL module</strong></a></li> <li><a href="/doc/modules/history_redis.html">Redis history module</a></li> <li><a href="/doc/modules/regexp.html"><strong>Regexp module</strong></a></li> <li><a href="/doc/modules/replies.html">Replies module</a></li> <li><a href="/doc/modules/reputation.html">Reputation module</a></li> <li><a href="/doc/modules/rspamd_update.html">Rspamd update module</a></li> <li><a href="/doc/modules/spamassassin.html">SpamAssassin rules module</a></li> <li><a href="/doc/modules/spamtrap.html">Spamtrap module</a></li> <li><a href="/doc/modules/spf.html">SPF module</a></li> <li><a href="/doc/modules/surbl.html"><del>SURBL module</del></a></li> <li><a href="/doc/modules/trie.html"><del>Trie module</del></a></li> <li><a href="/doc/modules/url_redirector.html">URL redirector module</a></li> <li><a href="/doc/modules/whitelist.html">Whitelist module</a></li> </ul> </li> <li class="r-docs-subnav list-group-item"> <a href="/doc/workers/">Workers documentation</a> <ul> <li><a href="/doc/workers/controller.html">Controller worker</a></li> <li><a href="/doc/workers/fuzzy_storage.html">Fuzzy storage worker</a></li> <li><a href="/doc/workers/normal.html">Normal worker (scanner)</a></li> <li><a href="/doc/workers/rspamd_proxy.html">Proxy worker</a></li> </ul> </li> <li class="r-docs-subnav list-group-item"> <a href="#">Developers documentation</a> <ul> <li><a href="/doc/developers/sync_async.html">Coroutines and async calls</a></li> <li><a href="/doc/developers/examples.html">Lua rules examples</a></li> <li><a href="/doc/developers/architecture.html">Rspamd architecture</a></li> <li><a href="/doc/developers/protocol.html">Rspamd protocol</a></li> <li><a href="/doc/developers/writing_rules.html">Writing Rspamd rules</a></li> <li><a href="/doc/developers/writing_tests.html">Writing tests for Rspamd</a></li> </ul> </li> <li class="r-docs-subnav list-group-item"> <a href="/doc/lua/">Lua API reference</a> <ul> <li> <a href="#">Rspamd Lua C API</a> <ul> <li><a href="/doc/lua/rspamd_task.html">Task module</a></li> <li><a href="/doc/lua/rspamd_mimepart.html">Message parts module</a></li> <li><a href="/doc/lua/rspamd_config.html">Configuration module</a></li> <li><a href="/doc/lua/rspamd_html.html">Html module</a></li> <li><a href="/doc/lua/rspamd_map.html">Maps module</a></li> <li><a href="/doc/lua/ucl.html">UCL module</a></li> <li><a href="/doc/lua/rspamd_regexp.html">Regexp module</a></li> <li><a href="/doc/lua/rspamd_ip.html">IP module</a></li> <li><a href="/doc/lua/rspamd_http.html">HTTP module</a></li> <li><a href="/doc/lua/rspamd_trie.html">Trie module</a></li> <li><a href="/doc/lua/rspamd_resolver.html">DNS module</a></li> <li><a href="/doc/lua/rspamd_expression.html">Expression module</a></li> <li><a href="/doc/lua/rspamd_redis.html">Redis module</a></li> <li><a href="/doc/lua/rspamd_upstream.html">Upstream module</a></li> <li><a href="/doc/lua/rspamd_logger.html">Logger module</a></li> <li><a href="/doc/lua/rspamd_cryptobox.html">Cryptobox module</a></li> <li><a href="/doc/lua/rspamd_url.html">URL module</a></li> <li><a href="/doc/lua/rspamd_tcp.html">TCP client module</a></li> <li><a href="/doc/lua/rspamd_udp.html">UDP client module</a></li> <li><a href="/doc/lua/rspamd_mempool.html">Memory pool module</a></li> <li><a href="/doc/lua/rspamd_util.html">Utilities module</a></li> <li><a href="/doc/lua/rspamd_text.html">Rspamd text module</a></li> </ul> </li> <li> <a href="#">Rspamd Plain Lua API</a> <ul> <li><a href="/doc/lua/lua_redis.html">Redis module</a></li> <li><a href="/doc/lua/lua_util.html">Utilities module</a></li> <li><a href="/doc/lua/lua_maps.html">Maps module</a></li> <li><a href="/doc/lua/lua_selectors.html">Selectors module</a></li> <li><a href="/doc/lua/lua_clickhouse.html">Clickhouse module</a></li> </ul> </li> </ul> </li> <li class="r-docs-subnav list-group-item"> <a href="#">Other topics</a> <ul> <li><a href="/doc/other/gtube_patterns.html">GTUBE-like test patterns</a></li> <li><a href="/doc/other/rspamadm.html">Rspamadm command</a></li> <li><a href="/doc/other/usage_policy.html">Services acceptable use policy</a></li> </ul> </li> <li class="r-docs-subnav list-group-item"> <a href="#">External resources</a> <ul> <li><a href="https://thomas-leister.de/en/mailserver-debian-stretch/" target="_blank">Dovecot, Postfix, MySQL, Rspamd on Debian 9 Stretch</a></li> <li><a href="http://www.0xf8.org/2018/05/an-alternative-introduction-to-rspamd-configuration-introduction/" target="_blank">Alternative introduction</a></li> <li><a href="https://web.archive.org/web/20240914211825/www.c0ffee.net/blog/mail-server-guide" target="_blank">Postfix, Dovecot, Rspamd, and LDAP on FreeBSD</a></li> <li><a href="https://github.com/vedetta-com/caesonia" target="_blank">OpenBSD Email Service relying on Rspamd</a></li> </ul> </li> </ul> </div> <div class="r-docs-content linkify-headers px-4"> <h1 id="about-rspamd">About Rspamd</h1> <h2 id="introduction">Introduction</h2> <p><strong>Rspamd</strong> is an advanced spam filtering system that allows evaluation of messages by a number of rules including regular expressions, statistical analysis and custom services such as URL black lists. Each message is analysed by Rspamd and given a <code class="language-plaintext highlighter-rouge">spam score</code>.</p> <p>According to this spam score and the user鈥檚 settings, Rspamd recommends an action for the MTA to apply to the message, for example, to pass, reject or add a header. Rspamd is designed to process hundreds of messages per second simultaneously, and provides a number of useful features.</p> <h2 id="getting-started">Getting Started</h2> <p>A good starting point to study how to install and configure Rspamd is <a href="/doc/tutorials/quickstart.html">the quick start guide</a>.</p> <p>Rspamd is <a href="/downloads.html">packaged</a> for the major Linux distributions, and is also available via <a href="https://freshports.org/mail/rspamd" target="_blank">FreeBSD ports</a>, NetBSD <a href="https://pkgsrc.org" target="_blank">pkgsrc</a> and <a href="https://openports.pl/path/mail/rspamd" target="_blank">OpenBSD ports</a>.</p> <p>You can also watch some <a href="/doc/about/media.html">videos about Rspamd</a>.</p> <h2 id="spam-filtering-features">Spam filtering features</h2> <p>Rspamd is shipped with various spam filtering modules and features enabled just out of the box. The full list of built-in modules could be found in the <a href="/doc/modules/">modules documentation</a>.</p> <p>If that is not enough, Rspamd provides an extensive <a href="/doc/lua/">Lua API</a> to <a href="/doc/developers/writing_rules.html">write your own rules and plugins</a>.</p> <h2 id="license">License</h2> <p>This project is licensed under the <a href="https://tldrlegal.com/license/apache-license-2.0-(apache-2.0)" target="_blank">Apache 2.0 License</a></p> <a class="button-fixed-bottom position-fixed rounded-circle bottom-0 end-0 m-4 z-2" href="#top"> <i class="fa-solid fa-lg fa-arrow-up position-absolute translate-middle"></i> </a> </div> </div> </div>  <footer class="row-footer footer mt-auto px-3 py-2 z-0"> <div class="row">  <div class="col d-inline-flex"> <a class="btn btn-xs btn-social-icon me-1 btn-primary" target="_blank" href="https://lists.rspamd.com/" data-bs-toggle="tooltip" data-bs-title="Mailing lists"><i class="fa-solid fa-envelope my-auto"></i></a> <a class="btn btn-xs btn-social-icon me-1 btn-reddit" target="_blank" href="ircs://irc.oftc.net/rspamd" data-bs-toggle="tooltip" data-bs-title="#rspamd on OFTC"> <p style="font-size:80%">IRC</p> </a> <a class="btn btn-xs btn-social-icon me-1 btn-telegram" target="_blank" href="https://t.me/rspamd" data-bs-toggle="tooltip" data-bs-title="Telegram"><i class="fa-solid fa-paper-plane my-auto"></i></a> <a class="btn btn-xs btn-social-icon me-1 btn-telegram" target="_blank" href="https://t.me/rspamd_ru" data-bs-toggle="tooltip" data-bs-title="Telegram RU"> <span class="fa-layers fa-fw my-auto"> <i class="fa-solid fa-paper-plane"></i> <i class="fa-solid fa-star fa-flip-vertical" style="color: red" data-fa-transform="shrink-13 left-4"></i> <i class="fa-solid fa-star fa-flip-vertical" style="color: red" data-fa-transform="shrink-13 right-4 down-4"></i> </span> </a> <a class="btn btn-xs btn-social-icon me-1 btn-github" target="_blank" href="https://github.com/rspamd/rspamd/discussions" data-bs-toggle="tooltip" data-bs-title="GitHub Discussions"><i class="fa-brands fa-github my-auto"></i></a> </div> <div class="col-auto d-inline-flex"> <a class="btn btn-xs btn-social-icon me-1 btn-primary" target="_blank" href="/sitemap.html" data-bs-toggle="tooltip" data-bs-title="Site map"><i class="fa-solid fa-folder-tree my-auto"></i></a> </div> <div class="col d-inline-flex"> </div> </div> </footer> <script src="https://code.jquery.com/jquery-3.7.1.min.js" integrity="sha256-/JqT3SQfawRcv/BIHPThkBvs0OEvtFFmqPF/lYI/Cxo=" crossorigin="anonymous"></script> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script> <script src='https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS_SVG' async></script> <script> /* global TypeHelpers */ (() => { "use strict"; 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