From: Greg A. Woods (no email)
Date: Sun Sep 01 2002 - 12:14:27 EDT
[ On Sunday, September 1, 2002 at 10:43:36 (-0500), Schmehl, Paul L wrote: ]
> Subject: RE: Using blacklists and RBL's with Postfix
>
> I think trying to filter spam based on addresses is a lost cause. In no
> time at all, your list will balloon into the thousands. Just one
> spammer can fill your list with , ,
> etc., etc.
It depends on how agressive you are, and what blacklist you use.
I use a number of DNSBLs, including bl.spamcop.net, in conjunction with
dnsbl.njabl.org, relays.ordb.org and relays.osirusoft.com. Together
they are almost 100% perfect, i.e. I receive only about one or two
direct-addressed spams per week.
You probably can't get away with using it on the central mail server of
a public ISP (or some types of Internet-based businesses, I suppose),
but in my world they produce absolutely no false positives!
For an ISP alone the latter two or three can really help out a lot and
they garner almost no (valid) complaints from ordinary end users.
See the following for a nearly comprehensive servey of DNSBLs:
http://www.declude.com/junkmail/support/ip4r.htm
-- Greg A. Woods +1 416 218-0098; <>; <> Planix, Inc. <>; VE3TCP; Secrets of the Weird <> - To unsubscribe, send mail to with content (not subject): unsubscribe postfix-users
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