PlusNet Newsletter classified as SPAM

I've just noticed that the PlusNet Newsletter that was sent to me on 21 October was classified as SPAM (see attached screen dump).

The full header is below (edited to remove email and IP addresses):

Return-path: <padmin@pih-cronhost01.servers.plus.net>
Envelope-to: *****
Delivery-date: Wed, 21 Oct 2009 17:50:52 +0100
Received: from [212.159.7.38] (helo=mx.ptn-ipin03.plus.net)
by fhw-inmx10.plus.net with esmtp (PlusNet MXCore v2.00) id 1N0eOh-0003HG-GU
for *****; Wed, 21 Oct 2009 17:50:51 +0100
Authentication-Results: mx.ptn-ipin03.plus.net; dkim=neutral (message not signed) header.i=none
Received-SPF: None identity=pra; client-ip=*****;
receiver=mx.ptn-ipin03.plus.net;
envelope-from="padmin@pih-cronhost01.servers.plus.net";
x-sender="autoemail@plus.net";
x-conformance=sidf_compatible
Received-SPF: None identity=mailfrom; client-ip=*****;
receiver=mx.ptn-ipin03.plus.net;
envelope-from="padmin@pih-cronhost01.servers.plus.net";
x-sender="padmin@pih-cronhost01.servers.plus.net";
x-conformance=sidf_compatible
Received-SPF: None identity=helo; client-ip=*****;
receiver=mx.ptn-ipin03.plus.net;
envelope-from="padmin@pih-cronhost01.servers.plus.net";
x-sender="postmaster@fhw-relay07.plus.net";
x-conformance=sidf_compatible
X-SBRS: -4.0
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: Ak7TAA/Z3kpUXebqPGdsb2JhbACBMgF0LiGDe5J8AYEqAQEBATevVoFlCAMEjziCOQ4IBIFeBIhHLg
X-IPAS: BSBLevel1
X-IronPort-AV: E=McAfee;i="5300,2777,5778"; a="188746578"
X-IronPort-AV: E=Sophos;i="4.44,598,1249254000";
d="scan'208,217";a="188746578"
Received: from relay07.plus.net (HELO fhw-relay07.plus.net) ([*****])
by mx.ptn-ipin03.plus.net with ESMTP; 21 Oct 2009 17:50:50 +0100
Received: from [212.159.15.148] (helo=pih-cronhost01.plus.net)
by fhw-relay07.plus.net with esmtp (Exim) id 1N0eOg-0000rz-HR; Wed, 21 Oct 2009 17:50:50 +0100
Received: from padmin by pih-cronhost01.plus.net with local (Exim 4.63)
(envelope-from <padmin@pih-cronhost01.plus.net>)
id 1N0eOg-00034V-FO; Wed, 21 Oct 2009 17:50:50 +0100
To: *****
From: Plusnet Customer Support <autoemail@plus.net>
Reply-To: Plusnet Customer Support <autoemail@plus.net>
CC:
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="=_dbd0ef5d10c5c9dcba1c1bd4e4e23e0d"
Message-Id: <E1N0eOg-00034V-FO@pih-cronhost01.plus.net>
Date: Wed, 21 Oct 2009 17:50:50 +0100
X-Plusnet-Relay: 459907c448a160d8dce05226fff01b53
X-pn-pstn: Spam 1
X-PN-Virus-Filtered: by PlusNet MXCore (v5.00)
X-PN-Spam-Filtered: by PlusNet MXCore (v5.00)
Subject: [-SPAM-] Welcome to the latest edition of Plus, the Plusnet Newsletter

PlusNet Newsletter classified as SPAM

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