SPAM from unsubscribed users on pgfoundry

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The past few days SPAM has been coming through the plr-general list on
pgfoundry. As far as I can tell the sender is not subscribed -- any idea
how this can happen or how to stop it?

Thanks,

Joe

p.s. example email and copy of mail headers below...

- -------- Original Message --------
Subject: [Plr-general] (no subject)
Date: Fri, 06 Sep 2013 03:02:26 +0300
From: Агентство интернет-рекламы <sKiDnowq@yahoo.com>
To: plr-general@pgfoundry.org

Реклама рекламы в интернете.

Возможные базы данных:
- - Москва и Санкт-Петербург;
- - Любые города РФ;
- - Организации любых сфер бизнеса;
- - Страны мира.

Любые формы оплаты.
Быстрый эффект.
Самые минимальные расценки на рынке.
Подробный отчет в личном кабинете.
7( Ч 9 5)  5 45  ~  1Ч  -  92
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From:
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Message-ID: <2013-09-06 03:02:26.00304184@localhost>
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Date: Fri, 06 Sep 2013 03:02:26 +0300
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