Date: Thu, 16 Oct 1997 19:28:46 -0700 (MST) From: "Chad R. Larson" <chad@freebie.dcfinc.com> To: Don.Lewis@tsc.tdk.com (Don Lewis) Cc: chad@dcfinc.com, root@eyelab.psy.msu.edu, dkelly@hiwaay.net, freebsd-stable@FreeBSD.ORG Subject: Re: Anti-spam sendmail in 2.2.5? Message-ID: <199710170228.TAA02679@freebie.dcfinc.com> In-Reply-To: <199710170156.SAA27779@salsa.gv.tsc.tdk.com> from Don Lewis at "Oct 16, 97 06:56:16 pm"
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> On Oct 15, 10:07pm, "Chad R. Larson" wrote: > } Subject: Re: Anti-spam sendmail in 2.2.5? > > } Also under consideration is insisting on a HELO during the SMTP > } handshake and doing a DNS lookup on that system. If they don't match, > } you refuse the traffic. > > I'm pretty sure this isn't strictly legal according to the RFCs, and it > will probably block some non-spam mail. That's not to say it's not > effective against spam. > > --- Truck The biggest problem is the places where the name of the system as reported by HELO and it's name as reported by DNS can legitimately differ. For example, mail that has been through a proxy server, or a NAT. That's why it's "under consideration", instead of implemented. We might be evaluating the lessor of two evils. -crl -- Chad R. Larson (CRL22) Brother, can you paradigm? 602-953-1392 chad@dcfinc.com chad@anasazi.com crl22@aol.com DCF, Inc. - 14523 North 49th Place, Scottsdale, Arizona 85254
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