On Oct 23, 2008, at 2:43 PM, Matt Juszczak wrote: >> PF and spamd in front of the MTA to do greylisting. > > Is PF postfix, or some other technology? pf is OpenBSD's packet filter. Great tool. It can be used to invoke grey listing. I wrote up what I did: http://www.freebsddiary.org/pf.php -- Dan Langille http://langille.org/