Once postfix is running you need to install SA to filter out spam.
wget http://mirrors.isc.org/pub/apache/spamassassin/source/Mail-SpamAssassin-3.1.9.tar.bz2 tar xjvf Mail-SpamAssassin-3.1.9.tar.bz2 cd Mail-SpamAssassin-3.1.9 perl Makefile.PL make make install
Start up spamd, add to boot scripts:
spamd &
Set up .procmailrc under $HOME:
DEFAULT=/export/home/wattersm/Maildir/
MAILDIR=/export/home/wattersm/Maildir/
LOGFILE=/export/home/wattersm/logs/procmail.log
SPAMFOLDER=/export/home/wattersm/Maildir/.Junk/
#
# SpamAssassin check
:0 wf
| /usr/bin/spamc
# File as SPAM
:0 w :$SPAMFOLDER/.lock
* ^X-spam-status: Yes
$SPAMFOLDER/.
:0e
{
EXITCODE=$?
}
:0
* ^FROM(LW Nagios)
.Nagios/
:0
* ^SUBJECT[Example Web, Inc. ID*]
.Support/