Recently active topics in Twitter tagged with could not be delivered

I just added twitter as an IM friend on Google Talk, by clicking 'add contact', then pasting in twitter@twitter.com, then inviting to gtalk.

The add worked just fine -- and quickly -- and was very impressive.

However, I believe that (at least for the procedure I followed for the add) Gmail emits a "<me> wants to chat" email. This email bounced. Here's a bowdlerized version, which will probably have disastrous formatting; if a tech support person with an @twitter.com email would like a copy of the original I'll send it along.

Delivered-To: me@foo.bar
Received: by 10.86.53.12 with SMTP id ################;
Sun, 6 Jan 2008 20:12:51 -0800 (PST)
Received: by 10.114.93.17 with SMTP id ################;
Sun, 06 Jan 2008 20:12:50 -0800 (PST)
Return-Path: <>
Received: from nelson.textdrive.com (nelson.textdrive.com [207.7.108.85])
by mx.google.com with ESMTP id ################;
Sun, 06 Jan 2008 20:12:50 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of nelson.textdrive.com designates 207.7.108.85 as permitted sender) client-ip=207.7.108.85;
Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of nelson.textdrive.com designates 207.7.108.85 as permitted sender) smtp.mail=
Received: by nelson.textdrive.com (Postfix)
id 1934E47738; Mon, 7 Jan 2008 04:12:33 +0000 (GMT)
Date: Mon, 7 Jan 2008 04:12:33 +0000 (GMT)
From: MAILER-DAEMON@nelson.textdrive.com (Mail Delivery System)
Subject: Undelivered Mail Returned to Sender
To: me@foo.bar
MIME-Version: 1.0
Content-Type: multipart/report; report-type=delivery-status;
boundary="AB51445113.1199679153/nelson.textdrive.com"
Message-Id: <20080107041233.1934E47738@nelson.text...>

This is a MIME-encapsulated message.

--AB51445113.1199679153/nelson.textdrive.com
Content-Description: Notification
Content-Type: text/plain

This is the Postfix program at host nelson.textdrive.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<twitter@twttr.com> (expanded from <twitter@twitter.com>): User unknown in
virtual alias table

--AB51445113.1199679153/nelson.textdrive.com
Content-Description: Delivery report
Content-Type: message/delivery-status

Reporting-MTA: dns; nelson.textdrive.com
X-Postfix-Queue-ID: AB51445113
X-Postfix-Sender: rfc822; me@foo.bar
Arrival-Date: Mon, 7 Jan 2008 04:12:32 +0000 (GMT)

Final-Recipient: rfc822; twitter@twttr.com
Original-Recipient: rfc822; twitter@twitter.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; User unknown in virtual alias table

--AB51445113.1199679153/nelson.textdrive.com
Content-Description: Undelivered Message
Content-Type: message/rfc822

Received: from ug-out-f141.google.com (ug-out-f141.google.com [66.249.92.141])
by nelson.textdrive.com (Postfix) with ESMTP id AB51445113
for <twitter@twitter.com>; Mon, 7 Jan 2008 04:12:32 +0000 (GMT)
Received: by ug-out-f141.google.com with SMTP id b30so163274ugd.4
for <twitter@twitter.com>; Sun, 06 Jan 2008 20:12:31 -0800 (PST)
################
DomainKey-Signature: a=rsa-sha1; c=nofws;
################
Received: by 10.86.89.4 with SMTP id ################
Sun, 06 Jan 2008 20:12:31 -0800 (PST)
Message-ID: <################>
Date: Sun, 6 Jan 2008 20:12:31 -0800
From: "My Name" <me@foo.bar>
Reply-To: me@foo.bar
To: twitter@twitter.com
Subject: Me wants to chat
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

-----------------------------------------------------------------------

Me wants to stay in better touch using some of
Google's coolest new
products.

If you already have Gmail or Google Talk, visit:
You'll need to click this link to be able to chat with <me>

To get Gmail ....
--AB51445113.1199679153/nelson.textdrive.com--
</me></postmaster></me>