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<title>Specification of the Exim Mail Transfer Agent: 28. The lmtp transport</title>
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<a name="The-lmtp-transport"></a>
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<h1 class="chapter"> 28. The lmtp transport </h1>
<p>The <code>lmtp</code> transport runs the LMTP protocol (RFC 2033) over a pipe to a
specified command
or by interacting with a Unix domain socket.
This transport is something of a cross between the <code>pipe</code> and <code>smtp</code>
transports. Exim also has support for using LMTP over TCP/IP; this is
implemented as an option for the <code>smtp</code> transport. Because LMTP is expected
to be of minority interest, the default build-time configure in ‘<tt>src/EDITME</tt>’
has it commented out. You need to ensure that
</p>
<table><tr><td> </td><td><pre class="example">TRANSPORT_LMTP=yes
</pre></td></tr></table>
<a name="IDX2194"></a>
<p>is present in your ‘<tt>Local/Makefile</tt>’ in order to have the <code>lmtp</code> transport
included in the Exim binary. The private options of the <code>lmtp</code> transport are
as follows:
</p>
<a name="IDX2195"></a>
<table>
<tr><td>
<p><code>batch_id</code></p></td><td><p> Use: <em>lmtp</em></p></td><td><p> Type: <em>string</em>*<em></em></p></td><td><p> Default: <em>unset</em>
</p></td></tr>
</table>
<p>See the description of local delivery batching in chapter <a href="spec_25.html#SEC221">Address batching in local transports</a>.
</p>
<a name="IDX2196"></a>
<table>
<tr><td>
<p><code>batch_max</code></p></td><td><p> Use: <em>lmtp</em></p></td><td><p> Type: <em>integer</em></p></td><td><p> Default: <em>1</em>
</p></td></tr>
</table>
<p>This limits the number of addresses that can be handled in a single delivery.
Most LMTP servers can handle several addresses at once, so it is normally a
good idea to increase this value. See the description of local delivery
batching in chapter <a href="spec_25.html#SEC221">Address batching in local transports</a>.
</p>
<a name="IDX2197"></a>
<table>
<tr><td>
<p><code>command</code></p></td><td><p> Use: <em>lmtp</em></p></td><td><p> Type: <em>string</em>*<em></em></p></td><td><p> Default: <em>unset</em>
</p></td></tr>
</table>
<p>This option must be set if <code>socket</code> is not set. The string is a command which
is run in a separate process. It is split up into a command name and list of
arguments, each of which is separately expanded (so expansion cannot change the
number of arguments). The command is run directly, not via a shell. The message
is passed to the new process using the standard input and output to operate the
LMTP protocol.
</p>
<a name="IDX2198"></a>
<table>
<tr><td>
<p><code>ignore_quota</code></p></td><td><p> Use: <em>lmtp</em></p></td><td><p> Type: <em>boolean</em></p></td><td><p> Default: <em>false</em>
</p></td></tr>
</table>
<a name="IDX2199"></a>
<p>If this option is set true, the string ‘<samp>IGNOREQUOTA</samp>’ is added to RCPT
commands, provided that the LMTP server has advertised support for IGNOREQUOTA
in its response to the LHLO command.
</p>
<a name="IDX2200"></a>
<table>
<tr><td>
<p><code>socket</code></p></td><td><p> Use: <em>lmtp</em></p></td><td><p> Type: <em>string</em>*<em></em></p></td><td><p> Default: <em>unset</em>
</p></td></tr>
</table>
<p>This option must be set if <code>command</code> is not set. The result of expansion must
be the name of a Unix domain socket. The transport connects to the socket and
delivers the message to it using the LMTP protocol.
</p>
<a name="IDX2201"></a>
<table>
<tr><td>
<p><code>timeout</code></p></td><td><p> Use: <em>lmtp</em></p></td><td><p> Type: <em>time</em></p></td><td><p> Default: <em>5m</em>
</p></td></tr>
</table>
<p>The transport is aborted if the created process or Unix domain socket does not
respond to LMTP commands or message input within this timeout. Delivery
is deferred, and will be tried again later. Here is an example of a typical
LMTP transport:
</p>
<table><tr><td> </td><td><pre class="example">lmtp:
driver = lmtp
command = /some/local/lmtp/delivery/program
batch_max = 20
user = exim
</pre></td></tr></table>
<p>This delivers up to 20 addresses at a time, in a mixture of domains if
necessary, running as the user <em>exim</em>.
</p>
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