Spam Filtering @ Monkeys.Com This page is now just a placeholder. It formerly contained information about local changes (hacks?) that had been made here at Monkeys.Com to the Postfix mail server sources, specifically to implement a simplified kind of e-mail source domain verification scheme. But all of those Postfix patches are nowadays obsolete, and can be largely if not entirely supplanted by a simple external Postfix policy server which does essentially the same job, and perhaps more. When and if I get the time to build the kind of Postfix policy server I'm thinking of, I'll place information about it here.