Spam I am...not

To: Retort
From: IB

Can any hackers among the Retort crew suggest a way, besides bowdlerizing, around the "message content" rejections encountered by the "Shave 'em Dry" posting? 
IB

Thus, e.g.,

Your message was blocked by our Spam Firewall. The email you sent with the following subject has NOT BEEN DELIVERED:

Subject: Shave 'em Dry, the play
Diagnostic-Code: smtp; 550 5.7.1 Message content rejected, UBE, id=31041-01-8
Received: from b.mail.sonic.net (b.mail.sonic.net [64.142.19.5])
by mail.exploratorium.edu (Spam Firewall) with ESMTP id 427772F30D