FYI, got this in response to a ticket reply.

Begin forwarded message:

From: Mail Delivery Subsystem <MAILER-DAEMON@mgw-da01.nokia.com>
Date: March 25, 2011 15:54:25 GMT+01:00
To: <lars.eggert@nokia.com>
Subject: Returned mail: see transcript for details

The original message was received at Fri, 25 Mar 2011 16:52:51 +0200
from esdhcp030222.research.nokia.com [172.21.30.222]

  ----- The following addresses had permanent fatal errors -----
<trac@meeting.ietf.org>
   (reason: 550 5.1.1 <trac@meeting.ietf.org>: Recipient address rejected: User unknown in local recipient table)

  ----- Transcript of session follows -----
... while talking to smtp.meeting.ietf.org.:
DATA
<<< 550 5.1.1 <trac@meeting.ietf.org>: Recipient address rejected: User unknown in local recipient table
550 5.1.1 <trac@meeting.ietf.org>... User unknown
<<< 554 5.5.1 Error: no valid recipients
Reporting-MTA: dns; mgw-da01.nokia.com
Received-From-MTA: DNS; esdhcp030222.research.nokia.com
Arrival-Date: Fri, 25 Mar 2011 16:52:51 +0200

Final-Recipient: RFC822; trac@meeting.ietf.org
Action: failed
Status: 5.1.1
Remote-MTA: DNS; smtp.meeting.ietf.org
Diagnostic-Code: SMTP; 550 5.1.1 <trac@meeting.ietf.org>: Recipient address rejected: User unknown in local recipient table
Last-Attempt-Date: Fri, 25 Mar 2011 16:52:55 +0200
Return-Path: <lars.eggert@nokia.com>
Received: from mail.fit.nokia.com (esdhcp030222.research.nokia.com [172.21.30.222])
by mgw-da01.nokia.com (Switch-3.4.3/Switch-3.4.3) with ESMTP id p2PEqmSV001700
(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
Fri, 25 Mar 2011 16:52:51 +0200
Subject: Re: [IETF Meeting/NOC] #336: hosting a file locally at the IETF
X-Virus-Status: Clean
X-Virus-Scanned: clamav-milter 0.97 at fit.nokia.com
Mime-Version: 1.0 (Apple Message framework v1084)
Content-Type: multipart/signed; boundary=Apple-Mail-15-635017720; protocol="application/pkcs7-signature"; micalg=sha1
From: Lars Eggert <lars.eggert@nokia.com>
In-Reply-To: <075.24873e567976e0d319dc91f887e03705@meeting.ietf.org>
Date: Fri, 25 Mar 2011 15:52:44 +0100
Cc: <karen.odonoghue@navy.mil>, <chelliot@pobox.com>
Message-Id: <732529F8-6812-41F0-A894-51AE52013E86@nokia.com>
References: <060.de3bf05542f8a4866417a83f1f04ef41@meeting.ietf.org> <075.24873e567976e0d319dc91f887e03705@meeting.ietf.org>
To: trac@meeting.ietf.org,
       =?iso-8859-1?Q?S=E9bastien_Barr=E9?= <sebastien.barre@uclouvain.be>
X-Mailer: Apple Mail (2.1084)
X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.2.6 (mail.fit.nokia.com); Fri, 25 Mar 2011 16:52:46 +0200 (EET)
X-Spam-Status: No, score=-100.1 required=5.0 tests=BAYES_00,MISSING_SUBJECT,
UNPARSEABLE_RELAY,USER_IN_WHITELIST autolearn=no version=3.3.1
X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on fit.nokia.com
X-Nokia-AV: Clean