extra headers, but only to certain addresses

[Chris Yuzik]

Hi everyone,

I've discovered something a bit odd, and it's got me stumped. Mail sent 
to some accounts get some extra headers tacked on to the top that all 
start with "X-Spam-", yet messages from the same address to other 
accounts on the same server don't get the headers. I've even tested 
sending the same message to both users and tailing their mailbox files, 
and indeed, headers are added in one case, but not another.

The extra headers are:

X-Spam-Checker-Version: SpamAssassin 3.1.8 (2007-02-13) on 
test.testserver5.com
X-Spam-Level:
X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00 autolearn=ham
        version=3.1.8

Does this mean these messages are being run through spamassassin twice? 
Or is there a setting in MailScanner that could be doing this? But I 
still don't understand the inconsistency.

Chris