How to make procmail work?

[Michael Hipp]

I'm trying to do:

fetchmail->postfix->procmail->dovecot->thunderbird

All works fine except procmail does not seem to be doing anything at 
all. Note that I am using Maildir format not mbox.

I added this line to /etc/postfix/main.cf
mailbox_command = /usr/bin/procmail -t -a "$EXTENSION"

Which is supposed to be all that is necessary to get postfix to use 
procmail to do the delivery.

My ~/.procmailrc file says this:
SHELL=/bin/sh                   #My shell ('which sh')
MAILDIR=$HOME/Maildir/          #My mail directory
LOGFILE=$HOME/procmail.log
VERBOSE=yes
DEFAULT=$MAILDIR

# Put everything in the Test folder for now
:0:
.Test/

I reloaded postfix and my messages seem to still end up in my Inbox 
instead of 'Test' tho I worry that some are ending up in neverland. 
Procmail is not logging anything anywhere that I can find.

Any suggestions?

Thanks,
Michael