disabling Spam Check for sender reports

[Jason Kau]

I apologize if this question has been asked before.

I can't figure how to keep sender reports (i.e. Sender Content Report,  
Sender Bad Filename Report, etc.) generated by MailScanner being Spam  
Checked.  How do define a ruleset for "Spam Checks = " that excludes  
the sender reports given the envelope is not set in the sender report?  
  For example, the headers of a sender report look like:

================================
Return-Path: <>
X-Original-To: astokes at jasper.k12.ga.us
Delivered-To: astokes at jasper.k12.ga.us
Received: by puma.jasper.k12.ga.us (Postfix, from userid 89)
         id 4073413405B; Tue,  7 Nov 2006 10:58:10 -0500 (EST)
From: "Jasper MailScanner" <postmaster at jasper.k12.ga.us>
To: astokes at jasper.k12.ga.us
Subject: Warning: Attachment stripped from email
Message-Id: <20061107155810.4073413405B at puma.jasper.k12.ga.us>
Date: Tue,  7 Nov 2006 10:58:10 -0500 (EST)
X-Jasper-County-Schools-MailScanner-Information: MailScanner+McAfee+ClamAV
X-Jasper-County-Schools-MailScanner: Found to be clean
X-Jasper-County-Schools-MailScanner-SpamCheck: not spam,
         SpamAssassin (not cached, score=0.9, required 5, BAYES_00 -2.60,
         NO_RELAYS -0.00, VIRUS_WARNING62 3.50)
X-Jasper-County-Schools-MailScanner-From:
X-Spam-Status: No
================================

This does not appear to match on "From: postmaster at jasper.k12.ga.us".

Thank you for your help.

-- 
Jason Kau
Consultant
Jasper County Schools
Monticello, GA