Problem with X-headers displayed in body

[Matthias Kellermann]

no not spam (whitelisted), SpamAssassin (Wertung=3.701, benoetigt 6,
	RCVD_IN_NJABL_DUL 1.71, RCVD_IN_SORBS_DUL 1.99)
X-net-Com-AG-MailScanner-From: mkellermann at net-com.de

Hello,

I've setup MailScanner on a Debian box with Postfix as MTA.
Everything works great except the header tagging of emails.

Some Email clients display parts of the x-headers in the message.
The full x-header added by MailScanner of an email that is not spam:

X-net-Com-AG-MailScanner: Found to be clean
no not spam (whitelisted), SpamAssassin (Wertung=3.791, benoetigt 6,
	RCVD_IN_NJABL_DUL 1.71, SPF_HELO_SOFTFAIL 2.08)
X-net-Com-AG-MailScanner-From: someone at somewhere.de

The x-header added by MailScanner of a spam mail:

X-net-Com-AG-MailScanner: Found to be clean
no spam, SpamAssassin (Wertung=17.321, benoetigt 6, HELO_DYNAMIC_DHCP 2.66,
	HTML_IMAGE_ONLY_08 2.44, HTML_MESSAGE 0.00,
	HTML_SHORT_LINK_IMG_1 0.28, MIME_HTML_MOSTLY 0.70,
	MPART_ALT_DIFF 0.14, URIBL_JP_SURBL 3.36, URIBL_OB_SURBL 2.62,
	URIBL_SC_SURBL 3.60, URIBL_WS_SURBL 1.53)
X-net-Com-AG-MailScanner-SpamScore: sssssssssssssssss
X-net-Com-AG-MailScanner-From: miranda at shinbiro.com

I think the problem is the part "no spam" or "no not spam" becauser 
there ist no X- in front of it.
How can i fix the header so all email clients display the message correctly?

Thanks in advance.

Best regards,
Matthias