Yizhar Hurwitz wrote: > I have found that for some reason unknown yet, MS Exchange 2003 SP2 does > not handle greylisting very well with default configuration,
I've never heard of that. We use greylisting and have never had problems receiving mail from MS Exchange users. Now, there *are* some marginal SMTP servers that fail in the following scenario: C: HELO myname.domain.com S: 250 whatever C: MAIL FROM:<[EMAIL PROTECTED]> S: 250 2.1.0 go ahead C: RCPT TO:<[EMAIL PROTECTED]> S: 451 4.7.1 greylisting; try in 2 minutes C: DATA S: 503 5.0.0 need RCPT! (and client bounces message) Notice that? Some marginal clients attempt a DATA even if all RCPTs are 4xx'd. Our solution is to greylist after the DATA phase (that is, at the ".") While this wastes bandwidth, it does keep those marginal SMTP implementations from failing. It also lets us log subject lines of greylisted mail, and we get lots of logs like this: what=greylisted, relay=222.46.49.130, [EMAIL PROTECTED], subject=Corel Draw what=greylisted, relay=59.1.51.100, [EMAIL PROTECTED], subject=High quality watches what=greylisted, relay=220.87.2.20, [EMAIL PROTECTED], subject=Replica Watches what=greylisted, relay=222.79.144.204, [EMAIL PROTECTED], subject=Replica Watches for Low Prices what=greylisted, relay=68.179.137.129, [EMAIL PROTECTED], subject=Adobe%2C Windows Under $50%2C and many more from Office XP what=greylisted, relay=61.53.255.73, [EMAIL PROTECTED], subject=Your woman wants a replica what=greylisted, relay=24.174.27.244, [EMAIL PROTECTED], subject=Trading Report For MicroCap what=greylisted, relay=65.171.68.158, [EMAIL PROTECTED], subject=The Daily Stock Barometer We block around 50% of all incoming mail just using greylisting. -- David. _______________________________________________ NOTE: If there is a disclaimer or other legal boilerplate in the above message, it is NULL AND VOID. You may ignore it. Visit http://www.mimedefang.org and http://www.roaringpenguin.com MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
