What I *meant* was "filter spam based on addresses" **in body and header
checks**. Of course the RBLs are the answer to *address* filtering.

Paul Schmehl (paulsutdallas.edu)
Supervisor, Support Services
University of Texas at Dallas
http://www.utdallas.edu/~pauls/
AVIEN Founding Member

> -----Original Message-----
> From: Greg A. Woods [mailto:woodsweird.com]
> Sent: Sunday, September 01, 2002 11:14 AM
> To: Schmehl, Paul L
> Cc: Friedrisch Muller; postfix-userspostfix.org
> Subject: RE: Using blacklists and RBL's with Postfix
>
>
> [ 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 abc123hotmail.com,
> > abc124hotmail.com, 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;            <g.a.woodsieee.org>;
<woodsrobohack.ca>
Planix, Inc. <woodsplanix.com>; VE3TCP; Secrets of the Weird
<woodsweird.com>
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