Thanks for the votes for answer b)!

>>b) Maybe I'd be better off with a few points (vs -100 from a whitelist) if
>>the received_from ends blackberry. I could write a rule for that, and
score
>>say -4.
>
>Write a rule to score the message by -2 if it is received from
*.blackberry.com
>
>Regards,
>-sm

How's this? Too loose?

header   CRACKBERRY Received =~ /blackberry.com\b/i
score    CRACKBERRY -2
describe CRACKBERRY Blackberry loses a lot on BASE64 rules, even it out.

Example header:

Received: from smtp01.bis.na.blackberry.com [216.9.248.48] by
mail.visioncomm.net with ESMTP (SMTPD32-13.5) id AC3534020148; Thu, 08 Feb
2007 10:05:25 -0500

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