I stole this from Here. Also see this. I think it's well worth configuring Postfix with these options (tuned to your exact needs, of course) to block SPAM. Blocking spammers with Postfix alone The battle between email admins and spammers is an ongoing arms race. The spammers are at a disadvantage because by and large, [...]
Browsing Posts tagged Spam
Postfix has some spam fighting abilities built in. However, you will need to enable them for them to work. Just throw the code below into your main.cf file and restart Postfix. Voila. smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining, reject_non_fqdn_recipient, reject_non_fqdn_sender, reject_unknown_recipient_domain, reject_unauth_destination, reject_invalid_hostname, reject_rbl_client sbl.spamhaus.org, reject_rbl_client xbl.spamhaus.org, permit
