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+PPoossttffiixx aanndd UUUUCCPP
+
+-------------------------------------------------------------------------------
+
+UUssiinngg UUUUCCPP oovveerr TTCCPP
+
+Despite a serious lack of sex-appeal, email via UUCP over TCP is a practical
+option for sites without permanent Internet connections, and for sites without
+a fixed IP address. For first-hand information, see the following guides:
+
+ * Jim Seymour's guide for using UUCP over TCP at http://jimsun.LinxNet.com/
+ jdp/uucp_over_tcp/index.html,
+ * Craig Sanders's guide for SSL-encrypted UUCP over TCP using stunnel at
+ http://taz.net.au/postfix/uucp/.
+
+Here's a graphical description of what this document is about:
+
+ LAN to Internet
+ Local network <---> UUCP <--- UUCP ---> to UUCP <---> Internet
+ Gateway Gateway
+
+And here's the table of contents of this document:
+
+ * Setting up a Postfix Internet to UUCP gateway
+ * Setting up a Postfix LAN to UUCP gateway
+
+SSeettttiinngg uupp aa PPoossttffiixx IInntteerrnneett ttoo UUUUCCPP ggaatteewwaayy
+
+Here is how to set up a machine that sits on the Internet and that forwards
+mail to a LAN that is connected via UUCP. See the LAN to UUCP gateway section
+for the other side of the story.
+
+ * You need an rrmmaaiill program that extracts the sender address from mail that
+ arrives via UUCP, and that feeds the mail into the Postfix sseennddmmaaiill
+ command. Most UNIX systems come with an rrmmaaiill utility. If you're in a
+ pinch, try the one bundled with the Postfix source code in the aauuxxiilliiaarryy//
+ rrmmaaiill directory.
+
+ * Define a pipe(8) based mail delivery transport for delivery via UUCP:
+
+ /etc/postfix/master.cf:
+ uucp unix - n n - - pipe
+ flags=F user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail
+ ($recipient)
+
+ This runs the uuuuxx command to place outgoing mail into the UUCP queue after
+ replacing $nexthop by the next-hop hostname (the receiving UUCP host) and
+ after replacing $recipient by the recipients. The pipe(8) delivery agent
+ executes the uuuuxx command without assistance from the shell, so there are no
+ problems with shell meta characters in command-line parameters.
+
+ * Specify that mail for example.com, should be delivered via UUCP, to a host
+ named uucp-host:
+
+ /etc/postfix/transport:
+ example.com uucp:uucp-host
+ .example.com uucp:uucp-host
+
+ See the transport(5) manual page for more details.
+
+ * Execute the command "ppoossttmmaapp //eettcc//ppoossttffiixx//ttrraannssppoorrtt" whenever you change
+ the ttrraannssppoorrtt file.
+
+ * Enable ttrraannssppoorrtt table lookups:
+
+ /etc/postfix/main.cf:
+ transport_maps = hash:/etc/postfix/transport
+
+ Specify ddbbmm instead of hhaasshh if your system uses ddbbmm files instead of ddbb
+ files. To find out what map types Postfix supports, use the command
+ "ppoossttccoonnff --mm".
+
+ * Add example.com to the list of domains that your site is willing to relay
+ mail for.
+
+ /etc/postfix/main.cf:
+ relay_domains = example.com ...other relay domains...
+
+ See the relay_domains configuration parameter description for details.
+
+ * Execute the command "ppoossttffiixx rreellooaadd" to make the changes effective.
+
+SSeettttiinngg uupp aa PPoossttffiixx LLAANN ttoo UUUUCCPP ggaatteewwaayy
+
+Here is how to relay mail from a LAN via UUCP to the Internet. See the Internet
+to UUCP gateway section for the other side of the story.
+
+ * You need an rrmmaaiill program that extracts the sender address from mail that
+ arrives via UUCP, and that feeds the mail into the Postfix sseennddmmaaiill
+ command. Most UNIX systems come with an rrmmaaiill utility. If you're in a
+ pinch, try the one bundled with the Postfix source code in the aauuxxiilliiaarryy//
+ rrmmaaiill directory.
+
+ * Specify that all remote mail must be sent via the uuuuccpp mail transport to
+ your UUCP gateway host, say, uucp-gateway:
+
+ /etc/postfix/main.cf:
+ relayhost = uucp-gateway
+ default_transport = uucp
+
+ Postfix 2.0 and later also allows the following more succinct form:
+
+ /etc/postfix/main.cf:
+ default_transport = uucp:uucp-gateway
+
+ * Define a pipe(8) based message delivery transport for mail delivery via
+ UUCP:
+
+ /etc/postfix/master.cf:
+ uucp unix - n n - - pipe
+ flags=F user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail
+ ($recipient)
+
+ This runs the uuuuxx command to place outgoing mail into the UUCP queue. It
+ substitutes the next-hop hostname (uucp-gateway, or whatever you specified)
+ and the recipients before executing the command. The uuuuxx command is
+ executed without assistance from the shell, so there are no problems with
+ shell meta characters.
+
+ * Execute the command "ppoossttffiixx rreellooaadd" to make the changes effective.
+