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. /etc/courier/uucpneighbors may also be a subdirectory instead of a plain text file, in which case the contents of all text files in this subdirectory is automatically concatenated by the makeuucpneighbors script.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. apple!john will get the mail with this return address, which should be repliable back to the sender. Courier's UUCP module will receive the UUCP address domain.com!someone, and translate it back as <someone@domain.com>.BUGS¶
Courier does not support defining multiple UUCP node names in /etc/courier/uucpme.SEE ALSO¶
esmtpd(8)[1], couriertcpd(8)[2], courier(8)[3].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
08/25/2013 | Courier Mail Server |