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<section id="the-lmtp-class">
<span id="lmtp"></span><h1>The LMTP class<a class="headerlink" href="#the-lmtp-class" title="Link to this heading"></a></h1>
<p><span class="target" id="index-0"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2033.html"><strong>RFC 2033</strong></a> defines the <span class="boldital">Local Mail Transport Protocol</span>.
In many ways, this is very similar to SMTP, but with no guarantees of queuing.
It is, in a sense, an alternative to ESMTP,
and is often used for local mail routing
(e.g. from a Mail Transport Agent to a local command or system)
where the unreliability of internet connectivity is not an issue.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">LMTP</span></code> class subclasses the <a class="reference internal" href="smtp.html#aiosmtpd.smtp.SMTP" title="aiosmtpd.smtp.SMTP"><code class="xref py py-class docutils literal notranslate"><span class="pre">SMTP</span></code></a> class
and its only functional difference is that
it implements the <code class="docutils literal notranslate"><span class="pre">LHLO</span></code> command,
and prohibits the use of <code class="docutils literal notranslate"><span class="pre">HELO</span></code> and <code class="docutils literal notranslate"><span class="pre">EHLO</span></code>.</p>
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