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<title>Postfix and UUCP </title>
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<h1><img src="postfix-logo.jpg" width="203" height="98" ALT="">Postfix and UUCP </h1>
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<h2><a name="uucp-tcp">Using UUCP over TCP</a></h2>
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<p> Despite a serious lack of sex-appeal, email via UUCP over TCP
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is a practical option for sites without permanent Internet connection,
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and for sites without a fixed IP address. For first-hand information,
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see the following guides: </p>
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<li> Jim Seymour's guide for using UUCP over TCP at
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<a href="http://jimsun.LinxNet.com/jdp/uucp_over_tcp/index.html">http://jimsun.LinxNet.com/jdp/uucp_over_tcp/index.html</a>,
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<li> Craig Sanders's guide for SSL-encrypted UUCP over TCP
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using stunnel at <a href="http://taz.net.au/postfix/uucp/">http://taz.net.au/postfix/uucp/</a>.
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Here's a graphical description of what this document is about:
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<tr> <td> Local network <tt> <---> </tt> </td>
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<td bgcolor="#f0f0ff" align="center"><a href="#lan-uucp">LAN to<br>
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UUCP<br> Gateway</a></td>
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<td> <tt> <--- </tt> UUCP <tt> ---> </tt> </td>
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<td bgcolor="#f0f0ff" align="center"><a href="#internet-uucp">Internet<br>
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to UUCP<br> Gateway</a></td>
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<td> <tt> <---> </tt> Internet </td> </tr>
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<p> And here's the table of contents of this document: </p>
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<li><a href="#internet-uucp">Setting up a Postfix Internet to UUCP
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<li><a href="#lan-uucp">Setting up a Postfix LAN to UUCP
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<h2><a name="internet-uucp">Setting up a Postfix Internet to UUCP
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<p> Here is how to set up a machine that sits on the Internet and
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that forwards mail to a LAN that is connected via UUCP. See
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the <a href="#lan-uucp">LAN to UUCP gateway</a> section for
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the other side of the story. </p>
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<li> <p> You need an <b>rmail</b> program that extracts the sender
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address from mail that arrives via UUCP, and that feeds the mail
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into the Postfix <b>sendmail</b> command. Most UNIX systems come
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with an <b>rmail</b> utility. If you're in a pinch, try the one
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bundled with the Postfix source code in the <b>auxiliary/rmail</b>
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<li> <p> Define a <a href="pipe.8.html">pipe(8)</a> based mail delivery transport for delivery
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/etc/postfix/master.cf:
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uucp unix - n n - - pipe
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flags=F user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
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<p> This runs the <b>uux</b> command to place outgoing mail into
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the UUCP queue after replacing $nexthop by the next-hop hostname
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(the receiving UUCP host) and after replacing $recipient by the
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recipients. The <a href="pipe.8.html">pipe(8)</a> delivery agent executes the <b>uux</b>
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command without assistance from the shell, so there are no problems
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with shell meta characters in command-line parameters. </p>
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<li> <p> Specify that mail for <i>example.com</i>, should be
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delivered via UUCP, to a host named <i>uucp-host</i>: </p>
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/etc/postfix/transport:
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example.com uucp:uucp-host
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.example.com uucp:uucp-host
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<p> See the <a href="transport.5.html">transport(5)</a> manual page for more details. </p>
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<li> <p> Execute the command "<b>postmap /etc/postfix/transport</b>"
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whenever you change the <b>transport</b> file. </p>
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<li> <p> Enable <b>transport</b> table lookups: </p>
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/etc/postfix/main.cf:
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<a href="postconf.5.html#transport_maps">transport_maps</a> = hash:/etc/postfix/transport
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<p> Specify <B>dbm</b> instead of <b>hash</b> if your system uses
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<b>dbm</b> files instead of <b>db</b> files. To find out what map
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types Postfix supports, use the command "<b>postconf -m</b>". </p>
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<li> <p> Add <i>example.com</i> to the list of domains that your site
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is willing to relay mail for. </p>
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/etc/postfix/main.cf:
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<a href="postconf.5.html#relay_domains">relay_domains</a> = example.com ...<i>other <a href="ADDRESS_CLASS_README.html#relay_domain_class">relay domains</a></i>...
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<p> See the <a href="postconf.5.html#relay_domains">relay_domains</a> configuration parameter description for
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<li> <p> Execute the command "<b>postfix reload</b>" to make the
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changes effective. </p>
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<h2><a name="lan-uucp">Setting up a Postfix LAN to UUCP
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<p> Here is how to relay mail from a LAN via UUCP to the
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Internet. See the <a href="#internet-uucp">Internet to UUCP
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gateway</a> section for the other side of the story. </p>
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<li> <p> You need an <b>rmail</b> program that extracts the sender
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address from mail that arrives via UUCP, and that feeds the mail
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into the Postfix <b>sendmail</b> command. Most UNIX systems come
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with an <b>rmail</b> utility. If you're in a pinch, try the one
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bundled with the Postfix source code in the <b>auxiliary/rmail</b>
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<li> <p> Specify that all remote mail must be sent via the <b>uucp</b>
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mail transport to your UUCP gateway host, say, <i>uucp-gateway</i>: </p>
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/etc/postfix/main.cf:
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<a href="postconf.5.html#relayhost">relayhost</a> = uucp-gateway
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<a href="postconf.5.html#default_transport">default_transport</a> = uucp
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<p> Postfix 2.0 and later also allows the following more succinct form: </p>
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/etc/postfix/main.cf:
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<a href="postconf.5.html#default_transport">default_transport</a> = uucp:uucp-gateway
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<li> <p> Define a <a href="pipe.8.html">pipe(8)</a> based message delivery transport for mail
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delivery via UUCP: </p>
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/etc/postfix/master.cf:
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uucp unix - n n - - pipe
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flags=F user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
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<p> This runs the <b>uux</b> command to place outgoing mail into
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the UUCP queue. It substitutes the next-hop hostname (<i>uucp-gateway</i>,
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or whatever you specified) and the recipients before executing the
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command. The <b>uux</b> command is executed without assistance
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from the shell, so there are no problems with shell meta characters.
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<li> <p> Execute the command "<b>postfix reload</b>" to make the
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changes effective. </p>
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