I'm thinking it's about time I dusted off the old whitelist script again, that bounces any email sent to me from an email address that's not pre-approved...
On another note: How do spammers get my email address? I never type it into web forms (that's what mailinator.com is for), I don't have it published in text form anywhere...
Edit: I first made a backup copy of, then edited my /etc/postfix/main.cf. Then used /etc/init.d/postfix restart to restart the mail system. Upon attempting to send an email from an outside domain, the following DNSBLs were dead and had to be removed from the .cf: relays.ordb.org, opm.blitzed.org, list.dsbl.org, multihop.dsbl.org.
My final config line liked like this:
Also I changed smtpd_helo_required = no to smtpd_helo_required = yes as recommended.