diplodocus.org Git - nmh/blob - docs/contrib/localpostproc

   1 #!/bin/sh
   2 #
   3 # localpostproc - A sample postproc which changes the submission email server
   4 #                 based on user-supplied criteria.
   5 #
   6 # The basic concept is that we change where we submit mail to based on the
   7 # message contents.  We use scan(1) to get out fields we care about.  But
   8 # really, you could use ANY criteria, such as environment variables,
   9 # recipients, etc etc.
  10 #
  11
  12 #
  13 # Find the draft message, always the last argument, and whether we've
  14 # been called with -whom;  the latter sucks.
  15 #
  16 # The case statement has to know about switches that take arguments;
  17 # add to this list as necessary.
  18 #
  19
  20 whom=0
  21
  22 find_draftmessage() {
  23         while test $# -gt 0; do
  24                 case "$1" in
  25                 -al* | -filt* | -wi* | -client | -idanno | -server | \
  26                 -partno | -saslmech | -user | -por* | -width | \
  27                 -file* | -mhl* | -mt* | -cr* | -lib* | -auth* | -sendmail)
  28                         shift
  29                         ;;
  30                 -whom)
  31                         whom=1
  32                         ;;
  33                 -*)     ;;
  34                 *)
  35                         draftmessage="$1"
  36                         return 0
  37                         ;;
  38                 esac
  39                 shift
  40         done
  41
  42         echo "Cannot find draft message name in argument list"
  43         exit 1
  44 }
  45
  46 realpost="$(mhparam libexecdir)/post"
  47
  48 if [ $# -eq 0 ]; then
  49         echo "Usage: [post switches] filename"
  50         exit 1
  51 fi
  52
  53 find_draftmessage "$@"
  54
  55 if [ $whom -eq 1 ]; then
  56         exec "$realpost" "$@"
  57 fi
  58
  59 fromhost=$(scan -format '%<{resent-from}%(host{resent-from})%|%(host{from})%>' -file "$draftmessage")
  60
  61 if [ $? -ne 0 ]; then
  62         echo "Unable to run scan on draft file $draftmessage, aborting"
  63         exit 1
  64 fi
  65
  66 if [ -z "$fromhost" ]; then
  67         echo "Could not determine hostname of From: address"
  68         exit 1;
  69 fi
  70
  71 #
  72 # Here we use the hostname in the "from" address, but you could use anything
  73 #
  74
  75 case "$fromhost" in
  76         *host1.com)
  77         postflags="-server smtp.host1.com -sasl -port submission"
  78         ;;
  79
  80         host2.com)
  81         postflags="-server smtp.host2.com -sasl -tls -port submission"
  82         ;;
  83
  84         *)
  85         echo "Don't know how to send email from $fromhost"
  86         exit 1
  87         ;;
  88 esac
  89
  90 exec "$realpost" $postflags "$@"