Gotcha!

Got the Spammers by using RBLs.

I put this in my postfix servers main.cf:

maps_rbl_domains = relays.ordb.org,
bl.spamcop.net

smtpd_recipient_restrictions =
permit_mynetworks,
reject_unauth_destination,
reject_maps_rbl,
permit

And now I get to see lots of open relays, probably home PC's taken over as zombies being rejected!

Good.

By the way, Postfix is brilliant, Well done Wietse Venema!


Update. So far on one server alone, 1200 spam emails bounced in 1 1/2 hours!

I'll have to roll it out elswhere.

Update at 17:30

Stopped 3258 spams that way. Bog off spammers!