Using procmail with postfix to filter mail

Look in /etc/postfix/main.cf
Look for this line ( change to this ):

mailbox_transport = procmail
mailbox_command = /usr/bin/procmail -t -a "$EXTENSION"

Create/Edit ~/.procmailrc

PATH=$PATH:/bin/:/procmail/bin:/usr/bin:$HOME/procmail/bin
SHELL=/bin/bash
DEFAULT=/var/mail/prm
MAILDIR=$HOME/
LOGFILE=$HOME/procmail/log/procmail.log
:0:
*
| $HOME/procmail/bin/poster.sh