This maybe trivial... One can blacklist a recipient as well: Customizing Spamassassin and working with BlackLists: Cd /etc/mail/spamassassin Vi sa-mimedefang.cf Add the following: #*****Added by PSL***** blacklist_to CamdenCyclingCampaign at yahoogroups.com # blacklist_from friend at public.com #*****Added by PSL*****