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[mills@cc.umanitoba.ca: Zmailer MTA breaks with DCC greylisting]

Here's a further message on ZMailer interoperability with the DCC
(Distributed Checksum Clearinghouse described at
"http://www.rhyolite.com/anti-spam/dcc/").  Based on preliminary
testing, ZMailer 2.99.55 shows the erroneous behaviour described by
Gary Mills but 2.99.56 correctly retries messages that are
"temporarily embargoed" by DCC's greylisting.

----- Forwarded message from Gary Mills <mills@cc.umanitoba.ca> -----

From:	Gary Mills <mills@cc.umanitoba.ca>
To:	dcc@rhyolite.com
Subject: Zmailer MTA breaks with DCC greylisting
User-Agent: Mutt/1.4.1i
Errors-To: dcc-admin@rhyolite.com
X-BeenThere: dcc@rhyolite.com
X-Mailman-Version: 2.0.5
Precedence: bulk
List-Unsubscribe: <http://www.rhyolite.com/mailman/listinfo/dcc>,
List-Id: Distributed Checksum Clearinghouse <dcc.rhyolite.com>
List-Post: <mailto:dcc@rhyolite.com>
List-Help: <mailto:dcc-request@rhyolite.com?subject=help>
List-Subscribe:	<http://www.rhyolite.com/mailman/listinfo/dcc>,
List-Archive: <http://www.rhyolite.com/pipermail/dcc/>
Date:	Tue, 23 Mar 2004 22:09:15 -0600

We had a complaint recently from a small university that was running
the Zmailer MTA.  At this end, e-mail from them was rejected by DCC
greylisting with a temporary delivery failure code.  There was no
sign of delivery re-tries.  At their end, the e-mail just disappeared,
without even a non-delivery report.

Adding their mail server to our greylist whitelist allowed the e-mail
to get through.  Apparently, Zmailer was treating the temporary delivery
failure as a successful delivery!  I don't know what version they are
running, but they are planning to upgrade to the latest version, in the
hope that that will fix the problem.

-Gary Mills-    -Unix Support-    -U of M Academic Computing and Networking-
DCC mailing list      DCC@rhyolite.com

----- End forwarded message -----

Roy Bixler <rcb@ucp.uchicago.edu>
The University of Chicago Press
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