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<title>smtpd-starttls-proxy - A proxy implementing STARTTLS in front of SMTP servers that do not</title>
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<meta name="Keywords" content="smtpd starttls proxy qmail-smtpd ucspi-tls laurent bercot ska skarnet" />
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<p>
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> smtpd-starttls-proxy </h1>
<h2> What is it ? </h2>
<p>
smtpd-starttls-proxy is a package implementing STARTTLS for
inetd-like mail servers that do not already support it.
</p>
<hr />
<h2> Installation </h2>
<h3> Requirements </h3>
<ul>
<li> A POSIX-compliant system with a standard C development environment </li>
<li> GNU make, version 3.81 or later </li>
<li> <a href="//skarnet.org/software/skalibs/">skalibs</a> version
2.11.0.0 or later. It's a build-time requirement. It's also a run-time
requirement if you link against the shared version of the skalibs
library. </li>
<li> <a href="//skarnet.org/software/s6/">s6</a> version
2.11.0.0 or later. It's a build-time and run-time requirement. </li>
<li> Recommended at run-time: <a href="//skarnet.org/software/s6-networking/">s6-networking</a> version
2.5.0.0 or later. It's not a requirement, but you won't be able
to do much with smtpd-starttls-proxy if you don't have a suitable
UCSPI-TLS server tool, and <a href="//skarnet.org/software/s6-networking/">s6-networking</a>
provides a simple one. </li>
</ul>
<h3> Licensing </h3>
<p>
smtpd-starttls-proxy is free software. It is available under the
<a href="https://opensource.org/licenses/ISC">ISC license</a>.
</p>
<h3> Download </h3>
<ul>
<li> The current released version of smtpd-starttls-proxy is
<em>none</em>, for now. It's only available via git. </li>
<!-- <a href="smtpd-starttls-proxy-0.0.1.0.tar.gz">0.0.1.0</a> </li> -->
<li> You can checkout a copy of the
<a href="//git.skarnet.org/cgi-bin/cgit.cgi/smtpd-starttls-proxy/">smtpd-starttls-proxy
git repository</a>:
<pre> git clone git://git.skarnet.org/smtpd-starttls-proxy </pre> </li>
<li> There's also a
<a href="https://github.com/skarnet/smtpd-starttls-proxy">GitHub mirror</a>
of the smtpd-starttls-proxy git repository. </li>
</ul>
<h3> Compilation </h3>
<ul>
<li> See the enclosed INSTALL file for installation details. </li>
</ul>
<h3> Upgrade notes </h3>
<ul>
<li> <a href="upgrade.html">This page</a> lists the differences to be aware of between
the previous versions of smtpd-starttls-proxy and the current one. </li>
</ul>
<hr />
<h2> Reference </h2>
<h3> Commands </h3>
<ul>
<li><a href="smtpd-starttls-proxy-io.html">The <tt>smtpd-starttls-proxy-io</tt> program</a></li>
</ul>
<h2> Related resources </h2>
<ul>
<li> <tt>smtpd-starttls-proxy</tt> is discussed on the
<a href="//skarnet.org/lists/#skaware">skaware</a> mailing-list. </li>
</ul>
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