:0 Whc: vacation.lock
# Perform a quick check to see if the mail was addressed to us
* $^To:.*\<(foo@domain.com|bar@domain.com)\>
# Don't reply to daemons and mailinglists
* !^FROM_DAEMON
# Mail loops are evil
* !^X-Loop: yourcompanyname
| formail -rD 8192 vacation.cache

:0 ehc         # if the name was not in the cache
| (formail -rI"Precedence: junk" \
   -A"X-Loop: yourcompanyname" ; \
   echo "I received your mail but I'm out of the office enjoying life.; \
) | $SENDMAIL -oi -t