Todd Lyons wanted us to know:

If mailbot would exit with errorlevels to indicate status or what it did, it would be the perfect solution. But it doesn't, so it isn't (at least not for me).

I ended up going with this solution. Bulky? Yes. But it does exactly what I'm looking for. I think I will work on adapting mailbot to do these things that I need (errorlevels, ability to choose between user generated and machine generated headers, and additional header checks). If not welcomed by the author (Mr Sam?), I'll just use it myself and leave a patch up for download on my site I guess.

In the mean time, here is the maildroprc that we're using (about to be in production) :

# Global maildrop filter file

logfile "/var/log/maildrop.log"

DEFAULT="$HOME/Maildir/"

`test -f $HOME/vacation.msg` if ( $RETURNCODE == 0 ) { log "Vacation mode, email delivery to $LOGNAME:" cc $DEFAULT

/^Precedence:.*/ if ( $MATCH =~ /bulk|list|junk/ ) { log "No vacation message: $MATCH" exit }

/^(X-BeenThere|X-Loop|Mailing-List|Auto-Submitted):.*/ if ( $MATCH ) { log "No vacation message: $MATCH" exit }

/^(From|Return-Path):.*/ if ( $MATCH =~ /MAILER-DAEMON/ ) { log "No vacation message: $MATCH" exit }

/^X-Spam-Status:.*/ if ( $MATCH =~ /Yes/:D ) { log "No vacation message: $MATCH" exit }

/^To: !.*/ TO=tolower($MATCH2)

/^Cc: !.*/ CC=tolower($MATCH2)

if ( ! ( ( $TO =~ /$LOGNAME/ ) || ( $CC =~ /$LOGNAME/ ) ) ) { log "No vacation message, not in To or Cc" exit }

xfilter "reformail -r -t -I 'From: $LOGNAME' -I 'X-Loop: Vacation for $LOGNAME'
-I 'Reply-To: $LOGNAME' -I 'Auto-Submitted: auto-replied' -I 'Precedence: bulk'" /^To:.*/ getaddr($MATCH) =~ /^.*/;

MATCH=tolower($MATCH); flock "vacation.lock" { `fgrep -iqx "$MATCH" vacation.lst 2>/dev/null || { \ echo "$MATCH" >> vacation.lst ; \ exit 1; \ } ` } if ( $RETURNCODE == 0 ) { log "Already sent vacation message to $MATCH\n" exit } log "Vacation message to $MATCH:" to "| (cat - ; echo ''; cat vacation.msg) | $SENDMAIL -t" } else { log "Normal mail delivery for $LOGNAME:" to "$DEFAULT" }