[ILUG] using postgrey as a cheap way to initially avoid lots of spam

[Brendan Kehoe]

I just set up the postgrey package as described at

   
http://www.debuntu.org/postfix-and-postgrey-a-proactive-approach-to-spam-filtering 


It's already saved a lot of CPU time on zen.org as it doesn't waste its 
time analyzing as much crap.  Pretty cool.  It just sends an SMTP 
message back asking for the message to be resent later, which reportedly 
isn't heeded by most spam distribution software.  At any rate, it seems 
to be working pretty well for me so far. :)

I found some debate about the risks of SMTP 450 errors causing mail to 
be discarded, but from what I can tell most major mail server apps just 
postpone delivery.

B