Thanks for your help guys.
I did enable spam assassin and restart it.
Here are my proc mail rules in entirety. something about spam asaassin but not much! Any further comments appreciated.
Current procmail rules file
#------------------------------------------------------------
# DO NOT MODIFY THIS FILE! It is updated automatically by the
# SME Server software. Instead, modify the source template in
# an /etc/e-smith/templates-custom directory. For more
# information, see
http://www.e-smith.org/custom/#
# copyright (C) 2002 Mitel Networks Corporation
#------------------------------------------------------------
# ---------------------------------------
# Default Shell, Program & file locations
# ---------------------------------------
SHELL=/bin/bash
DEFAULT=$HOME/Maildir/
FORMAIL=/usr/bin/formail
MAILDIR=$HOME/Mail
PMDIR=$HOME
SENDMAIL=/usr/sbin/sendmail
# ------------
# some logging
# ------------
VERBOSE=no
LOGFILE=$HOME/procmail.log
# -------------------------------
# SpamAssassin Router
# -------------------------------
:0fw
| /usr/bin/spamc
0
# --------------------------
# all else goes to the inbox
# --------------------------
:0
$DEFAULT