Anybody understand procmail really well???

Well, yikes.

I'm trying to set up a sort-of mailing list (maybe I should bite
the bullet and go for a FULL mailing list???) using procmail,
and all I get now is errors from postfix saying that I've got
a forwarding loop.

Here's an excerpt from my procmailrc file:

PATH=/bin:/usr/bin:/usr/bin
MAILDIR=$HOME/Mail      #you'd better make sure it exists
DEFAULT=$MAILDIR/mbox   #completely optional
LOGFILE=$MAILDIR/from   #recommended

:0
* ^From.*(from1|from2|from3)
om)
{
    :0 c
    ! `cat .forward.list`

    :0
    pnpg.mailings
}

:0
* ^From.*(from4|from5|from6)
om)
{
    :0 c
    ! `cat .forward.list`

    :0
    pnpg.mailings
}

So, what have I done wrong?

Thanks! (Maybe its time to set up a good mailing list program -
suggestions?)