Provided by: sn_0.3.8-10.1build1_amd64 
NAME
snmail - mail-to-news filter
SYNOPSIS
snmail [-sP] [listname [prefix]]
DESCRIPTION
snmail reads a single email message on standard input, and writes the converted message to standard
output. This output is suitable for feeding to snstore.
snmail does these conversions: If the first line is a UUCP From_ line, it is silently discarded; a
Newsgroups: line is added with the value of prefixlistname (prefix concatenated with listname), and other
existing Newsgroups: lines are removed; and a Path: line is created from all Received: lines, which are
removed; all header lines are unfolded; if no message ID exists, one is created; message IDs in all
References: lines and In-Reply-To: lines are collected into a single References: line; all lines are
rewritten to end in CRLF; and a lone . on a line is written at the end of the message.
snmail will accept and pass on messages with invalid header fields.
snmail is meant to be run from a .forward or the /etc/aliases file (if you're using sendmail or similar)
or from a .qmail file (if you're using qmail). snmail may write status or error messages to standard
error.
OPTIONS
-s Pipe output to snstore directly, do not write to standard output. This is so the exit status is
not lost in a shell pipeline. If you use this flag, it is also a good idea to also use -c (tell
snstore to check if article already exists).
Other options
snmail also accepts options intended for snstore, viz. -c, -v, and -n, and these are passed on
uninterpreted.
ARGUMENTS
prefix is the prefix of the newsgroup; if not specified, it defaults to local. (note the trailing .).
prefix may not begin with a . (dot) but it may be empty.
listname
completes the newsgroup name; if not specified, it is the local part of the address in the Return-
Path: line if it exists and isn't empty; otherwise it is the local part of the messages' first
From:. So if the message originated from the list <linux-lemmings@vger.rutgers.edu>, then the
default newsgroup becomes local.linux-lemmings. listname may be empty if prefix isn't.
You may want to have a file /var/spool/sn/prefixlistname/.nopost to deny posting from all and
sundry, to prevent the mailing list newsgroup from being contaminated.
prefix and listname may contain uppercase characters; these are converted to lower case.
USAGE
There are two ways of forwarding mail to the sn news spool: directly from a user's mail address; or
forwarded to a central address and then invoking snmail. The central concern here is permissions; while
anyone can run snmail, not everyone may store mail in the spool. Mail setups vary a lot, so basically
you're on your own here.
ENVIRONMENT VARIABLES
SNROOT If this is set and is not empty, the value is used in place of /var/spool/sn, the default news
spool directory.
PATH If -s was specified, determines where to look for snstore, before looking in /usr/sbin.
EXIT STATUS
snmail exits 0 if the message was successfully converted and written, or if the message ID already exists
in the ID database and the message was not stored or converted.
snmail exits with 1 on usage error, 2 on operational error, 3 if the mail message wasn't in the proper
format.