MAILDIR=/home/username/mail
LOGFILE=/home/username/spamfilter/log/procmail.log
VERBOSE=no

# code to prevent mail from looping
:0
* ! ^X-Loop: username@yourdomain\.org
{
   # safety net (backup mail - just in case)
   :0c:
   backup

   :0 fhw
   | formail -A "X-Loop: username@yourdomain.org"
  
   # spam filter (do not pass go. do not collect $200)
   :0:spam.lock
   * ? $HOME/bhjp/spamfilter.pl
   potential-spam

   :0:
   ${DEFAULT}
}

#discard any loops
:0
* ^X-Loop: username@yourdomain\org.
looping