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4
edge/introduction/index.html
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@ -1732,7 +1732,7 @@ MUA <---- STARTTLS ---- ┤(143) MDA ╯ |
└─────────────────────┘
┗━━━━━━━━━━ Retrieval ━━━━━━━━━━┛
</code></pre></div>
<p>If you're new to email infrastructure, both that table and the schema may be confusing.<br />
<p>If you're new to email infrastructure, both that table and the schema may be confusing.
Read on to expand your understanding and learn about <code>docker-mailserver</code>'s configuration, including how you can customize it.</p>
<h3 id="submission-smtp"><a class="toclink" href="#submission-smtp">Submission - SMTP</a></h3>
<p>For a MUA to send an email to an MTA, it needs to establish a connection with that server, then push data packets over a network that both the MUA (client) and the MTA (server) are connected to. The server implements the <a href="https://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol">SMTP</a> protocol, which makes it capable of handling <em>Submission</em>.</p>
@ -1767,7 +1767,7 @@ Me ---------------&gt; ┤ ├ -----------------&gt; ┊
</ul>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This Submission setup is sometimes refered to as <a href="https://en.wikipedia.org/wiki/SMTPS">SMTPS</a>. Long story short: this is incorrect and should be avoided.</p>
<p>This Submission setup is sometimes referred to as <a href="https://en.wikipedia.org/wiki/SMTPS">SMTPS</a>. Long story short: this is incorrect and should be avoided.</p>
</div>
<p>Although a very satisfactory setup, Implicit TLS on port 465 is somewhat "cutting edge". There exists another well established mail Submission setup that must be supported as well, SMTP+STARTTLS on port 587. It uses Explicit TLS: the client starts with a cleartext connection, then the server informs a TLS-encrypted "upgraded" connection may be established, and the client <em>may</em> eventually decide to establish it prior to the Submission. Basically it's an opportunistic, opt-in TLS upgrade of the connection between the client and the server, at the client's discretion, using a mechanism known as <a href="https://en.wikipedia.org/wiki/Opportunistic_TLS">STARTTLS</a> that both ends need to implement.</p>
<p>In many implementations, the mail-server doesn't enforce TLS encryption, for backwards compatibility. Clients are thus free to deny the TLS-upgrade proposal (or <a href="https://security.stackexchange.com/questions/168998/what-happens-if-starttls-dropped-in-smtp">misled by a hacker</a> about STARTTLS not being available), and the server accepts unencrypted (cleartext) mail exchange, which poses a confidentiality threat and, to some extent, spam issues. <a href="https://tools.ietf.org/html/rfc8314#section-3.3">RFC 8314 (section 3.3)</a> recommends for a mail-server to support both Implicit and Explicit TLS for Submission, <em>and</em> to enforce TLS-encryption on ports 587 (Explicit TLS) and 465 (Implicit TLS). That's exactly <code>docker-mailserver</code>'s default configuration: abiding by RFC 8314, it <a href="http://www.postfix.org/postconf.5.html#smtpd_tls_security_level">enforces a strict (<code>encrypt</code>) STARTTLS policy</a>, where a denied TLS upgrade terminates the connection thus (hopefully but at the client's discretion) preventing unencrypted (cleartext) Submission.</p>

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@ -2,202 +2,202 @@
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/faq/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/introduction/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/environment/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/pop3/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/setup.sh/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/auth-ldap/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/dovecot-master-accounts/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/full-text-search/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/ipv6/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/kubernetes/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-fetchmail/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-sieve/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/optional-config/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/podman/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-forwarding/aws-ses/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/mail-forwarding/relay-hosts/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/maintenance/update-and-cleanup/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/override-defaults/dovecot/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/override-defaults/postfix/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/advanced/override-defaults/user-patches/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/best-practices/autodiscover/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/best-practices/dkim/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/best-practices/dmarc/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/best-practices/spf/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/fail2ban/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/mail_crypt/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/ssl/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/security/understanding-the-ports/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/troubleshooting/debugging/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/user-management/accounts/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/config/user-management/aliases/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/contributing/general/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/contributing/issues-and-pull-requests/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/basic-installation/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/blog-posts/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/docker-build/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/tutorials/mailserver-behind-proxy/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/forward-only-mailserver-with-ldap-authentication/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://docker-mailserver.github.io/docker-mailserver/edge/examples/use-cases/imap-folders/</loc>
<lastmod>2023-01-10</lastmod>
<lastmod>2023-01-11</lastmod>
<changefreq>daily</changefreq>
</url>
</urlset>