.procmailrc:

MAILDIR=$HOME/.Maildir/
DEFAULT=$MAILDIR
LOCKFILE=$DEFAULT/.procmailLock
VERBOSE=yes
LOGFILE=$DEFAULT/procmail.log

# TO matches To and CC

:0
* ^TO.*thisaddress
 sendmail@to_here.com

:0
* ^TO.*mailinglist
$MAILDIR/.maillinglist/

:0:
* ^From.*root
$MAILDIR/.sysadmin/

:0:
* ^TO_\/(ports)@
{
 :0 c # if from this, copy to this folder
 * ^From.*(interesting)
 .interesting/

 :0  # move all email to this one
 .ports/
}