Spam in this forum

Why is the piece of software called "amavisd-new" at Relay1.suse.de keeps evaluating some messages posted to this forum as spam and accordingly sticking the word SPAM at the beginning of the subject field? You will see this if one looks at the full header to an original, newly posted SPAM message in this forum. Cheers. -- This computer is environment-friendly and is running on OpenSuSE 10.1