Illegal chars in subject causes missed tagging?

[Peter Bonivart]

I noticed today that I received spam that wasn't tagged and looked at 
the headers. As you can see it is spam and it has two subject headers, 
one is tagged and one is not. Outlook shows the last one, the one 
without the tag. SA triggered the SUBJ_ILLEGAL_CHARS test, could it be 
that the subject starts with a "-" that causes it to be doubled?

Subject: {Spam?} - Vi har sålt Kulan till Adecco
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary=DD-MS-6e270ebbc2d52966675f
From: "xxxxxxxxxxx.com" <info at xxxxxxxxxxxxxxxx.com>
Subject: - Vi har sålt Kulan till Adecco
X-LiO-MailScanner-SpamCheck: spam, SpamAssassin (score=4.052, required 4,
        BAYES_00 -2.00, HTML_FONTCOLOR_RED 0.10, HTML_FONTCOLOR_UNSAFE 0.10,
        HTML_MESSAGE 0.10, MIME_MISSING_BOUNDARY 1.84,
        SUBJ_ILLEGAL_CHARS 3.91)
         ^^^^^^^^^^^^^^^^^^^^^^^

I cut out a couple of lines but the lines between the two subject 
headers are intact except for me scrambling the from contents.

Any ideas?

-- 
/Peter Bonivart

--Unix lovers do it in the Sun

Sun Fire V210, Solaris 9, Sendmail 8.12.10, MailScanner 4.25-14,
SpamAssassin 2.63 + DCC 1.2.30, ClamAV 0.67 + GMP 4.1.2, MailStats 0.25