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Re: [Asrg] Re: RMX evaluation

Vernon Schryver <vjs@calcite.rhyolite.com> Thu, 08 May 2003 19:34 UTC

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From: Vernon Schryver <vjs@calcite.rhyolite.com>
Message-Id: <200305081932.h48JWQIi000399@calcite.rhyolite.com>
To: asrg@ietf.org
Subject: Re: [Asrg] Re: RMX evaluation
References: <20030508183651.GA12130@danisch.de>
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Date: Thu, 08 May 2003 13:32:26 -0600

> From: Hadmut Danisch <hadmut@danisch.de>

> >   1. an SMTP server first compares the reverse DNS name of the SMTP
> >    client with the sender domain.  If they match by the usual rules
> >    (e.g. user@example.com matches mailhost.example.com), then the STMP
> >    client is authorized.  To prevent forgery, the usual reverse-forward
> >    DNS check is made.
>
> This doesn't work in common. A host can have only one reverse DNS
> name, but deliver for many different domains. 

That check is only the first check.  If it fails, then no harm is done. 

Moreover, as was recently discussed in this mailing list, a host can
have many reverse DNS names.  See the thread that contains
https://www1.ietf.org/mail-archive/working-groups/asrg/current/msg04280.html

Note that I've removed the test case mentioned in that message. 
If there is any doubt that it worked, I can easily restore it.


Vernon Schryver    vjs@rhyolite.com
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