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Article #542Re: SMTP source verification.
From: Scott Alexander
Date: Wed, 31 Jul 1985 01:52
Date: Wed, 31 Jul 1985 01:52
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So you check my ip addr and it agrees with my name in the host table. But if this is my workstation, I can cause it to build ip packets w/ any addr I like. So now instead of just faking the HELO command I have to fake ip packets, too. On an ethernet, even checking the ethernet addr doesn't tell you anything since I can often reset it. There is no way to get around faking mail. You can make it harder. The people with whom I have dealt who are willing to go to the trouble to fake mail are willing to format ip packets also. Scott Alexander Rice University salex@rice (713) 527-6012
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: arc1-ca.pugleaf.net!utzoo!linus!philabs!cmcl2!seismo!brl-tgr!tgr!salex@RICE.ARPA From: salex@RICE.ARPA (Scott Alexander) Newsgroups: net.mail.headers Subject: Re: SMTP source verification. Message-ID: <327@brl-tgr.ARPA> Date: Tue, 30-Jul-85 21:52:43 EDT Article-I.D.: brl-tgr.327 Posted: Tue Jul 30 21:52:43 1985 Date-Received: Thu, 1-Aug-85 20:48:05 EDT Sender: news@brl-tgr.ARPA Lines: 15