table of contents
COURIERUUCP(8) | Double Precision, Inc. | COURIERUUCP(8) |
NAME¶
courieruucp - Sample Courier mail filterSYNOPSIS¶
makeuucpneighbors
DESCRIPTION¶
The Courier mail server is capable of sending and receiving mail via UUCP. Courier does not implement UUCP directly, but instead uses third-party UUCP software, which you must install separately. Courier´s UUCP support is provided automatically by the courieruucp module, which is compiled and installed by default. Courier sends mail via UUCP by issuing a request via uux to execute the rmail command on the remote UUCP node. Courier passes the message envelope sender to rmail via the -f flag, and lists the message envelope recipients as the remaining arguments. Message envelope addresses and E-mail addresses in the headers of the message will be appropriately rewritten. Courier will only send mail via UUCP if it knows about the recipient´s UUCP node. The configuration file /etc/courier/uucpneighbors is a plain text configuration file. The makeuucpneighbors script compiles this configuration file into a binary database that is read by Courier. Changes to /etc/courier/uucpneighbors do not take effect until makeuucpneighbors is executed, and Courier is restarted.Contents of /etc/courier/uucpme¶
This configuration file must be initialized to contain the UUCP node name that this machine is known to its neighbors. If /etc/courier/uucpme does not exist, Courier uses the first node name of the hostname specified by the /etc/courier/me configuration file.Contents of /etc/courier/uucpneighbors¶
Note that in addition to creating this configuration file you must also configure your UUCP software to appropriately route UUCP mail to the specified nodes, which is a completely separate task. Blank lines in this file are ignored. Lines that start with the # character are comments, and are also ignored. The remaining lines are in the following format:node<TAB>flags
Unrestricted forwarding. This flag will accept
any UUCP path that starts with the specified node. Example:
This will accept "food!fruits!apple", "food!fruits!banana",
"food!drinks!orangejuice", and so on. You may simply list all your
immediate UUCP neighbors using the F flag, and accept mail to any address
that´s reachable via any neighbor.
G
food<TAB>F
This is a gateway. This flag is identical to
the F flag, except that rmail is executed on the specified node.
Normally, Courier will issue a uux request to run rmail on the
last node, for example " uux food!fruits!rmail apple". Using
G instead of F will run rmail on the listed node, for example "
uux food!rmail fruits!apple".
R
This is a relay. This flag is used where
neither F or G flags are appropriate, but you want to run rmail on this
node. For example:
In this example mail to "food!fruits!apple" is sent by executing
" uux food!rmail fruits!apple". If the R flag is not
specified, then Courier will request " uux food!fruits!rmail
apple".
food!fruits food<TAB>R
Contents of /etc/courier/module.uucp¶
This is the standard Courier module configuration file. MAXDELSMaximum simultaneous UUCP deliveries. This
setting is a bit misleading. From Courier´s viewpoint, a delivery
consists only of running uux to queue up the message via UUCP. Once
uux returns, the message is delivered, as far as Courier is concerned.
UUCP is responsible for getting the message the rest of the way. Therefore,
UUCP deliveries tend to be fairly quick, and it is not necessary to configure
a large number of concurrent courieruucp processes, since each one will
terminate quickly. Once uux terminates, the UUCP software is
responsible for queueing and sending the message.
MAXHOST
Maximum simultaneous UUCP deliveries to the
same UUCP node. Since UUCP deliveries tend to be fairly quick, it is not
usually necessary to use MAXHOST to limit concurrent deliveries to the
same UUCP node, so MAXHOST should generally be set to the same value as
MAXDELS.
MAXRCPT
Maximum recipients per message. When the same
message is sent to multiple recipients on the same UUCP node, Courier is
capable of asking to run rmail only one, and listing all the recipients
together. MAXRCPT specifies the upper limit on the number of recipients
that are batched together. You want to set a limit based on any limitations on
the length of command lines that´s imposed by the operating system.
Sending the same message to different UUCP nodes is always handled as separate
deliveries.
HEADER AND ADDRESS REWRITING¶
Courier is certainly capable of relaying mail between the Internet - via ESMTP - and UUCP-land, rewriting headers and addresses appropriately. The address rewriting rules are fixed, but they are expected to work in nearly every case. If you find yourself in some oddball situation, you´ll just have to invest the time to add custom header rewriting code. If you are example.com, and your UUCP node is example, then <user@example.com> gets rewritten as example!user. Internet mail may be sent via ESMTP to your UUCP neighbor apple!john by sending it to <apple!john@example.com>. When that´s forwarded via UUCP the return address of <someone@domain.com> will be rewritten as example!domain.com!someone.BUGS¶
Courier does not support defining multiple UUCP node names in /etc/courier/uucpme.SEE ALSO¶
AUTHOR¶
Sam VarshavchikAuthor
NOTES¶
- 1.
- esmtpd(8)
[set
$man.base.url.for.relative.links]/esmtpd.html
- 2.
- couriertcpd(8)
[set
$man.base.url.for.relative.links]/couriertcpd.html
- 3.
- courier(8)
[set
$man.base.url.for.relative.links]/courier.html
04/04/2011 | Courier Mail Server |