False Subject change - ham mail marked as spam

[Götz Reinicke]

Hi,

today some mails to our mailinglist-system from allowed students are
changed to spam in the subject.

The header of the mail shows that this messages shouldn't be spam; e.g.:

X-Filmakademie-MailScanner: Found to be clean, Found to be clean
X-Filmakademie-MailScanner-SpamCheck: spam, spamhaus-ZEN,
	SpamAssassin (nicht zwischen gespeichert, Wertung=-16.8,
	benoetigt 3.6, autolearn=not spam, ALL_TRUSTED -1.80,
	BAYES_00 -15.00), not spam,
	SpamAssassin (zwischen gespeichert, Wertung=-16.8, benoetigt 3.6,
	autolearn=not spam, ALL_TRUSTED -1.80, BAYES_00 -15.00)
Subject: [Studenten-list] =?iso-8859-1?q?=7BSpam=3F=7D_Nachtr=E4ge=3A?=

Any ideas what goes wrong?

Where to start debugging?

Thanks for any hints and tips!


Regards
Götz
-- 
Götz Reinicke
IT Koordinator

Tel. +49 7141 969 420
Fax  +49 7141 969 55 420
E-Mail goetz.reinicke at filmakademie.de

Filmakademie Baden-Württemberg GmbH
Mathildenstr. 20
71638 Ludwigsburg
www.filmakademie.de

Eintragung Amtsgericht Stuttgart HRB 205016
Vorsitzender des Aufsichtsrats:
Dr. Christoph Palmer, MdL, Minister a.D.

Geschäftsführer:
Prof. Thomas Schadt