Quick envelope_sender_header question

[Mauricio Tavares]

	I recently decided to add mailscanner to my postfix-based mail server. 
After it was installed and I unleashed it, I decided to

# MailScanner --lint

which gave me only one error message (assuming my domain is mydomain.com):

ERROR: The "envelope_sender_header" in your spam.assassin.prefs.conf
ERROR: is not correct, it should match X-mydomain_com-MailScanner-From


I have defined in MailScanner.conf org-name and org-long-name as

%org-name% = mydomain

%org-long-name% = This is my domain

and, to be on the safe side, I defined envelope_sender_header in 
spam.assassin.prefs.conf to be "mydomain." What am I missing here?