spam messages coming in via maxima mailing list

Hello,

I've been receiving some spam messages lately via the Maxima mailing list.
Gmail lets them through because (from what I can tell from reading the
message headers) Gmail assumes math.utexas.edu is not sending spam.
Is it possible that a host at UT has been compromised?
(Well, it is certainly possible, but how can we tell, is the question.)

I've attached an example header for the benefit of readers who have
avoided these messages so far. Any comments are appreciated.

Robert

PS.

> Delivered-To: robert.dodier at gmail.com
> Received: by 10.141.185.13 with SMTP id m13cs70103rvp;
>         Sun, 2 Dec 2007 11:06:06 -0800 (PST)
> Received: by 10.100.205.9 with SMTP id c9mr4803777ang.1196622365666;
>         Sun, 02 Dec 2007 11:06:05 -0800 (PST)
> Return-Path: <mailman-bounces at math.utexas.edu>
> Received: from ibm3.ma.utexas.edu ([146.6.139.124])
>         by mx.google.com with ESMTP id m30si10677100elf.2007.12.02.11.05.53;
>         Sun, 02 Dec 2007 11:06:05 -0800 (PST)
> Received-SPF: pass (google.com: domain of mailman-bounces at math.utexas.edu designates 146.6.139.124 as permitted sender) client-ip=146.6.139.124;
> Authentication-Results: mx.google.com; spf=pass (google.com: domain of mailman-bounces at math.utexas.edu designates 146.6.139.124 as permitted sender) smtp.mail=mailman-bounces at math.utexas.edu
> Received: from ibm3.ma.utexas.edu (mail.ma.utexas.edu [128.83.133.205])
>       by ibm3.ma.utexas.edu (8.13.6/8.13.6/Debian-1) with ESMTP id lB2J5rl1030265
>       for <robert.dodier at gmail.com>; Sun, 2 Dec 2007 13:05:53 -0600
> Received: from ironlung.mail.utexas.edu (ironlung.mail.utexas.edu
>       [128.83.32.54])
>       by ibm3.ma.utexas.edu (8.13.6/8.13.6/Debian-1) with ESMTP id
>       lB2J4JFM030132; Sun, 2 Dec 2007 13:05:51 -0600
> X-IronPort-MID: 273215911
> X-SBRS: 1.4
> X-IronPort-Anti-Spam-Filtered: true
> X-IronPort-Anti-Spam-Result: Am/9ADOQUkfBRLtacmdsb2JhbACDJ4N5Tw
> X-BrightmailSpam: true
> X-IronPort-AV: E=Sophos;i="4.23,241,1194242400"; d="scan'208";a="273215911"
> Received: from digsys90-187.pip.digsys.bg (HELO home-ghemciajcm)
>       ([193.68.187.90])
>       by ironlung.mail.utexas.edu with ESMTP; 02 Dec 2007 13:04:16 -0600
> Received: from [193.68.187.90] by m1.dnsix.com; , 2 Dec 2007 21:02:58 +0200
> From: "Keith Rogers" <emnmtofrpt at bohebo.com>
> To: <maxima at math.utexas.edu>
> Subject: Eat what you want without gaining in weight!
> Date: , 2 Dec 2007 21:02:58 +0200
> MIME-Version: 1.0
> Content-Type: text/plain;
>       charset="windows-1250"
> Content-Transfer-Encoding: 7bit
> X-Mailer: Microsoft Office Outlook, Build 11.0.5510
> Thread-Index: Aca6QLWA3URW6XCXB6L8M0FN4BUBXC==
> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180
> Message-ID: <01c83526$b76ea410$5abb44c1 at emnmtofrpt>
> Sender: mailman-bounces at math.utexas.edu
> Errors-To: mailman-bounces at math.utexas.edu

<content snipped>