I'm considering a greylisting setup for WCNet.org to help slow the influx of spam that we have to run thru the backend spamd scanners. It's pretty bad these days. I've read a fair amount about the topic, but figured I'd ask here for any gotchas or horror stories.
As a point of reference, my implementation will probably be Exim 4.xx and greylistd.
On the hardware side, the main mail server is dual processor Sun 280R with 1GB RAM. Exim hands messages off to procmail which calls SpamAssassin via the spamc client. There are currently 4 backend boxes that host spamd processes.
On a slow day, we handle 150,000 messages. On busier days it's closer to 250,000.
I considered just using Spey, since a greylisting SMTP proxy would drop in very easily, but it doesn't seem to be very battle tested yet.
We're staying with Exim, so please don't suggest a non-Exim solution. Thanks for any input on this.
Posted by jzawodn at October 17, 2004 09:18 PM