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<title>The Exim FAQ Section 15</title>
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<h1>The Exim FAQ</h1>
<a href="FAQ.html#TOC">Contents</a>
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<h2><a href="FAQ.html#TOC317">15. UUCP</a></h2>
<p>
<a name="TOC318" href="FAQ.html#TOC318">Q1501:</a> The MX records for some UUCP domains point to my local host. How do I
get it to pass the messages on to UUCP?
</p>
<p>
<font color="#00BB00">A1501:</font> The simplest way is to create a file containing a list of domains, and
the hosts to which their messages should be sent, like this:
</p>
<pre>
uucp1.domain.example: uucp1.host.example
uucp2.domain.example: uucp2.host.example
....</pre>
<p>
Then you can use a router like this:
</p>
<pre>
uucp_router:
driver = accept
domains = lsearch;/etc/uucp/domains
transport = uucp_transport</pre>
<p>
and a transport like this:
</p>
<pre>
uucp_transport:
driver = pipe
user = nobody
command = /usr/local/bin/uux - -r $domain_data!rmail $local_part
return_fail_output</pre>
<p>
The <i>$domain_data</i> variable retains the value that is looked up when
the <tt>domains</tt> option in the router is matched.
</p>
<p>
<a name="TOC319" href="FAQ.html#TOC319">Q1502:</a> How can I get Exim to handle “bang path” addresses?
</p>
<p>
<font color="#00BB00">A1502:</font> In general, you can't (Exim is an Internet mailer and recognizes only
RFC 2822 domain-style addresses) but some restricted kinds of bang path
can be dealt with by appropriate rewriting - but please note the warning
below.
</p>
<p>
Exim treats a bang path address as an unqualified local part, and so
will qualify it with your domain. A rule such as
</p>
<pre>
\N^([^!]+)!(.+)@your\.domain$\N $2@$1</pre>
<p>
turns <i>a!b@your.domain</i> into <i>b@a</i>. You can also use a repeating rule to
turn multi-component paths into the “percent hack” notation with a rule
such as
</p>
<pre>
\N^([^!]+)!([^@%]+)(.+)$\N $2%$1$3 R</pre>
<p>
which turns <i>a!b@c</i> into <i>b%a@c</i> and <i>a!b!c@d</i> first into <i>b!c%a@d</i> and then,
because of the R flag, into <i>c%b%a@d</i>. The R flag causes repetition up to
10 times.
</p>
<p>
<b>Warning:</b> If you install a general rewriting rule like the above, you are
opening yourself up to the possibility of unwanted relaying. A host that
is not permitted to relay through your system could send a message with
an SMTP command line such as
</p>
<pre>
RCPT TO:<victim-host!victim-user@your.domain></pre>
<p>
and this would be accepted because it is addressed to your domain.
However, the rewriting then converts the address, and the message does
in fact get relayed. One way round this, if all your bang path messages
are passed to Exim via SMTP, is to use the <tt>S</tt> rewriting flag. This
applies a rewriting rule to incoming SMTP addresses as soon as they are
received, before checking for qualification, relaying, etc. So a rule
such as
</p>
<pre>
\N^([^!]+)!(.+)$\N $2@$1 S</pre>
<p>
rewrites simple two-component bang paths before the result is checked
for relaying. However, this does not rewrite addresses in the headers of
the message.
</p>
<p>
<a name="TOC320" href="FAQ.html#TOC320">Q1503:</a> We see something strange on our system in regards to mail coming in via
rmail from a UUCP link. The sender is being set to mailmaster instead of
the real sender, and a <i>Sender:</i> header is being added to the message.
</p>
<p>
<font color="#00BB00">A1503:</font> If <i>mailmaster</i> is the user that is running rmail, you need to include
that user in the <tt>trusted_users</tt> configuration option. Only trusted users
are permitted to specify senders when mail is passed to Exim via the
command line.
</p>
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