Something like this inserted after your main call to SA: :0: * ^X-Spam-Status: No | spamassassin -d
Change the first line from:
:0:
to:
:0fc
As written, the rule would try to lock the spamassassin program, which might cause weird issues, and since it doesn't include the 'c' option it would simply throw away the message after removing the headers.
