Why are this message and reply bouncing?

I'd be grateful for your help with some bouncing messages. My list is set
up so only owners can post. Jenny can post from her ...oxford.ac.uk
address, not yet the new one. I'm unsure which she used to post this but I
followed the instructions for bounced messages and it posted fine.

But when I tried to post a reply in the mailing list, my reply bounced. Can
anyone explain why and what I should do? (Do you need to see the bounce
message from my reply post too?)

Is it anything to do with that line "To: <[email protected]>"
which is the new e-mail address?

Thanks

Clare

-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: 01 August 2005 08:49
To: [email protected]
Subject: BOUNCE [email protected]: Admin request:
/^subject:\s.*\bchange\b.*\baddress\b/i

From [email protected] Mon Aug  1 08:49:01 2005
Received: from tigershark.unitedhosting.co.uk (root@localhost)
        by hphl.org.uk (8.12.10/8.12.10) with ESMTP id j717mxPL021051
        for <[email protected]>; Mon, 1 Aug 2005 08:49:00 +0100
X-ClientAddr: 163.1.2.163
Received: from relay5.mail.ox.ac.uk (relay5.mail.ox.ac.uk [163.1.2.163])
        by tigershark.unitedhosting.co.uk (8.12.10/8.12.10) with ESMTP id
j717mu6h021029
        for <[email protected]>; Mon, 1 Aug 2005 08:48:57 +0100
Received: from gwmail.jr2.ox.ac.uk ([163.1.212.1])
        by relay5.mail.ox.ac.uk with esmtp (Exim 4.50)
        id 1DzV2i-0007vm-HZ
        for [email protected]; Mon, 01 Aug 2005 08:49:00 +0100
Received: from Medicine-MTA by gwmail.jr2.ox.ac.uk
        with Novell_GroupWise; Mon, 01 Aug 2005 08:49:00 +0100
Message-Id: <[email protected]>
X-Mailer: Novell GroupWise Internet Agent 6.5.4
Date: Mon, 01 Aug 2005 08:48:25 +0100
From: "Jennifer Smith" <[email protected]>
To: <[email protected]>
Subject: Change of email address
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Disposition: inline
X-UnitedHosting.co.uk-MailScanner-Information: Please contact the ISP for
more information
X-UnitedHosting.co.uk-MailScanner: Not scanned: please contact your
Internet E-Mail Service Provider for details
X-MailScanner-From: [email protected]
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by hphl.org.uk id
j717n1PL021059

Dear All,
[...rest of Jenny's message cut ...]
...


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