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Re: [Asrg] C/R Interworking Framework

Yakov Shafranovich <research@solidmatrix.com> Wed, 04 June 2003 23:15 UTC

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To: Vernon Schryver <vjs@calcite.rhyolite.com>, asrg@ietf.org
From: Yakov Shafranovich <research@solidmatrix.com>
Subject: Re: [Asrg] C/R Interworking Framework
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Date: Wed, 04 Jun 2003 19:13:32 -0400

At 01:11 PM 6/4/2003 -0600, Vernon Schryver wrote:

> > From: Yakov Shafranovich <research@solidmatrix.com>
>
> > ...
> > The main problem with VRFY is that it allows the spammer to verify 
> addresses.
> > ...
>
>This is a minor issue, but pleast note that the main problem with VRFY
>is that many and perhaps most SMTP servers have it turned off.  No
>one with the faintest familiarity with how spam, spam filters, and
>even general STMP installation testing today uses VRFY.  Instead we
>all do what the spammers do many 10's of millions and perhaps billions
>of times every day.  Instead of sending the sequence of SMTP commands
>
>    HELO
>    VRFY
>
>we send
>
>    HELO
>    MAIL From
>    RCPT To
>
>The result of the second sequence is not perfect (e.g with Yahoo),
>but it is far more likely to work than the first.

However, if we are defining an SMTP process for CRI protocols, can we use 
the VRFY command as a part of an ESMTP extension?

Yakov  

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