usualy search "mail" and get any of the filter (Results 1 - 10 of 101 for mail)
the 1st is http://www.vmware.com/appliances/directory/76013 and say including Postfix,
ClamAV, Spamassassin ... Powerful e-mail anti-spam filter Self-updating e-mail
the 2nd is http://www.vmware.com/appliances/directory/964 and say Postfix, SpamAssassin 3.2.3, ClamAV, Postgres 8.1, Apache2, etc.
if search for all tags should be find some