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 out which message is the draft message; yes, this sucks.
  14 #
  15 # The case statement has to know about switches that take arguments;
  16 # add to this list as necessary.
  17 #
  18
  19 whom=0
  20
  21 find_draftmessage() {
  22         while test $# -gt 0; do
  23                 case "$1" in
  24                 -al* | -filt* | -wi* | -client | -idanno | -server | \
  25                 -partno | -saslmech | -user | -por* | -width | \
  26                 -file* | -mhl* | -mt* | -cr* | -lib* | -auth* | -sendmail)
  27                         shift
  28                         ;;
  29                 -whom)
  30                         whom=1
  31                         ;;
  32                 -*)     ;;
  33                 *)
  34                         draftmessage="$1"
  35                         return 0
  36                         ;;
  37                 esac
  38                 shift
  39         done
  40
  41         echo "Cannot find draft message name in argument list"
  42         exit 1
  43 }
  44
  45 realpost="$(mhparam libdir)/post"
  46
  47 if [ $# -eq 0 ]; then
  48         echo "Usage: [post switches] filename"
  49         exit 1
  50 fi
  51
  52 find_draftmessage "$@"
  53
  54 if [ $whom -eq 1 ]; then
  55         exec "$realpost" "$@"
  56 fi
  57
  58 fromhost=$(scan -format '%<{resent-from}%(host{resent-from})%|%(host{from})%>' -file "$draftmessage")
  59
  60 if [ $? -ne 0 ]; then
  61         echo "Unable to run scan on draft file $draftmessage, aborting"
  62         exit 1
  63 fi
  64
  65 if [ -z "$fromhost" ]; then
  66         echo "Could not determine hostname of From: address"
  67         exit 1;
  68 fi
  69
  70 #
  71 # Here we use the hostname in the "from" address, but you could use anything
  72 #
  73
  74 case "$fromhost" in
  75         *host1.com)
  76         postflags="-server smtp.host1.com -sasl -port submission"
  77         ;;
  78
  79         host2.com)
  80         postflags="-server smtp.host2.com -sasl -tls -port submission"
  81         ;;
  82
  83         *)
  84         echo "Don't know how to send email from $fromhost"
  85         exit 1
  86         ;;
  87 esac
  88
  89 exec "$realpost" $postflags "$@"