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       snmail - mail-to-news filter


       snmail [-sP] [listname [prefix]]


       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


       -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.


       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.

              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-
    >, 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.


       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.


       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.


       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.