Procmail auto-reply
From VVCWiki
~/.procmalrc
SHELL=/bin/bash
:0 hc
* !^FROM_DAEMON
* !^FROM_MAILER
* !^X-Loop: autoreply
* ^Subject:.*
| (formail -rt -A"Precedence: junk"\
-A"X-Loop: autoreply" ; \
cat $HOME/autoreply.txt ) | $SENDMAIL -t