wildcard characters in rules

Hello Forum Members,

our spam filter marks the spam messages by modifying the subject. The subject of spam messages starts with ***SPAM*** . So I wrote a GW rule to move these messages into the SPAM folder. But no matter what I do, I cannot escape the star characters. If I write a rule "Subject begins with ***SPAM***" then it will match every email that has the "spam" string in the subject anywhere. So a message with the subject "Please do not mark this email as spam" will match and move the email into the spam folder. How can I escape the star character in messages, so GW won't interpret it as a wildcard character? If it is not possible, then I will write to the ideas portal.

TIA,
Gellert