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RE: OT: Change of address

2004-07-08 07:15:12
From: spf(_at_)metro(_dot_)cx
Sent: Thursday, July 08, 2004 8:55 AM


On Thu, Jul 08, 2004 at 08:07:12AM -0500, Seth Goodman wrote:
I have been absolutely deluged with SPAM since I joined this mailing
list.  Is it possible the spammers hate what we're trying to
do and are
venting their anger at us?

Yes, that is exactly what they do.  Don't worry about getting
back at them,
just win.  Reject it all before DATA based on connecting IP and
PTR name.
Start with dynamic IP DSL and cable connections (regexp's or
DNSBL), then
add DNSBL's for known spam sources.  You will be very
pleasantly surprised.
Reductions of 95% are easily achievable.

Never mind the dozens of false positives, just be happy with the
95% decrease.

Or was that 'dynamic ip (dsl and cable)' and not '(dynamic ip
dls) and cable'?

Sloppy wording on my part, so thanks for bringing it up.  You had it right:
dynamic IP DSL and dynamic IP cable (not too common, these days).  I believe
that some "dial-up" lists also include static IP cable netblocks where the
provider has stated that customers in these netblocks are not permitted to
run a mailer (at least they used to include those).  If you do this with
reasonable care, you will rarely get a false positive.  When you
occasionally do, it will generate a DSN, not get silently dropped as with a
content filter.  No disappearing email and no dozens of false positives.  If
some of your correspondents insist on running rogue mailers, whitelist them
and/or ask them to get a legitimate setup.

--

Seth Goodman


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