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Date: Sun, 10 May 1998 10:39:36 +0200
To: "D. J. Bernstein" <djb@cr.yp.to>, drums@cs.utk.edu
From: Jacob Palme <jpalme@dsv.su.se>
Subject: Re: ehlo survey

At 01.57 +0200 98-05-10, D. J. Bernstein wrote:
> I just did another SMTP server survey, using the 16 million IP addresses
> found in the 199701 NW DNS walk.

Very interesting data!
>
> 8218 IP addresses responded, out of 200000 hosts. 72% accepted EHLO. The
> following chart shows the percentage supporting various ESMTP options:
>     0% x-rcptlimit
>     0% x-turnme
>     0% xadr
>     1% xaud
>     0% xdsn
>     1% xexch50
>     0% xgen
>     1% xone
>     1% xque
>     2% xremotequeue
>     0% xsta
>     0% xtrn
>    37% xusr
>     1% xvrb

Is there any documentation of all these x-extensions to ESTMP? Especially
"xusr" which seems to be commonly supported. What does it mean, how it
is used? Is it a way of saying that this is a message submission directly
from the sending UA?

------------------------------------------------------------------------
Jacob Palme <jpalme@dsv.su.se> (Stockholm University and KTH)
for more info see URL: http://www.dsv.su.se/~jpalme