So, it turns out this is pretty easy to do; attached is the postproc
wrapper I cooked up to send to different mail servers based on the
"From" address. Of course, you could really use any algorithm you want;
this is just an example. I can't claim this is perfect, but I think
it's a good first effort, and I've started to use it. Hope this is
helpful for people!
--Ken
#!/bin/sh
#
# localpostproc - decide where to send email based on the draft message
#
realpost="$(mhparam libdir)/post"
if [ $# -eq 0 ]; then
echo "Usage: [post switches] filename"
exit 1
fi
eval draftmessage=\${$#}
fromhost=$(scan -format '%(host{from})' -file "$draftmessage")
if [ $? -ne 0 ]; then
echo "Unable to run scan on draft file $draftmessage, aborting"
exit 1
fi
if [ -z "$fromhost" ]; then
echo "Could not determine hostname of From: address"
exit 1;
fi
case "$fromhost" in
*some.other.host)
postflags="-server some.other.server -sasl -port submission"
;;
pobox.com)
postflags="-server smtp.pobox.com -sasl -tls -port submission"
;;
*)
echo "Don't know how to send email from $fromhost"
exit 1
;;
esac
exec "$realpost" $postflags "$@"
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