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From: galvin@udel.EDU (James M Galvin)
Newsgroups: comp.mail.misc
Subject: Re: Is there really no TURN command in sendmail's SMTP?
Message-ID: <398@louie.udel.EDU>
Date: Tue, 28-Jul-87 08:59:15 EDT
Article-I.D.: louie.398
Posted: Tue Jul 28 08:59:15 1987
Date-Received: Wed, 29-Jul-87 05:44:32 EDT
References: <1726@ubvax.UUCP> <6745@dartvax.UUCP> <1701@xanth.UUCP>
Reply-To: galvin@udel.EDU (James M Galvin)
Organization: University of Delaware
Lines: 16

In article <1701@xanth.UUCP> kyle@xanth.UUCP (Kyle Jones) writes:
>> 2. I doubt that you'll find anyone who has actually hacked it in... it's
>> really a bigger deal than it seems.
>Sendmail wouldn't have to do all that!  It would simply have to go through its
>queuefiles, looking at the envelope of each letter and determine which ones go
>to the host on the other end of the SMTP connection.

The reason there is no TURN command is much more fundamental.  How do you
verify the identity of the "calling" entity reliably enough to believe you
are giving the mail to the right entity?

True, the security is marginally better when you are doing the "calling"
to deliver, but it is better.

-- 
James M Galvin