Ancient spambayes-dev messages popping up, maybe via spamlab.co.uk?

I received four or five spambayes-dev messages today that were dated in
2004.  Looking at the received headers:

    Received: from mail.mojam.com [198.49.126.96]
            by montanaro.dyndns.org with IMAP (fetchmail-6.3.4)
            for <skip@localhost> (single-drop);
            Mon, 25 Sep 2006 13:02:47 -0500 (CDT)
    Received: from fence.pobox.com (fence.pobox.com [208.210.124.76])
            by orca.mojam.com (Postfix) with ESMTP id EAABF1170024
            for <[email protected]>; Mon, 25 Sep 2006 12:01:04 -0600 (MDT)
    Received: from fence.pobox.com (localhost [127.0.0.1])
            by fence.pobox.com (Postfix) with ESMTP id 6A7CB72C
            for <[email protected]>; Mon, 25 Sep 2006 14:01:26 -0400 (EDT)
    Delivered-To: [email protected]
    Received: from prodrts7.prod.spamlab.co.uk (unknown [213.208.70.139])
            by fence.pobox.com (Postfix) with ESMTP id EF14B755
            for <[email protected]>; Mon, 25 Sep 2006 14:01:21 -0400 (EDT)
    Received: from prodrts0 (prodrts0.prod.spamlab.co.uk [172.16.139.50])
            by prodrts7.prod.spamlab.co.uk (8.13.1/8.13.1) with SMTP id
            k8PIuu4g012727; Mon, 25 Sep 2006 19:56:56 +0100
    List-Archive: <http://mail.python.org/pipermail/spambayes-dev>
    X-Spam-Status: No, hits=-4.9 required=5.0 tests=AWL,
            BAYES_00 autolearn=ham version=2.70-cvs
    List-Post: <mailto:[email protected]>
    In-Reply-To: Message from "Seth Goodman" <[email protected]> of "Tue,
            13 Jan 2004 17:40:29 CST."
            <MHEGIFHMACFNNIMMBACACEFAHDAA.nobody-0XdUWXLQalXR7s880joybQ@public.gmane.org>

it appears they originated somewhere outside of python.org, perhaps
spamlab.co.uk.  (cc'ing their postmaster just in case...)

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