SpamCop FAQ : SpamCop Parsing and Reporting Service :
It is recommended the default settings in SpamAssassin be:

• skip_rbl_checks 1
• required_hits 10
• auto_report_threshold 30
• rewrite_subject 0
• report_header 1
• use_terse_report 1
• defang_mime 0
• spam_level_stars 0

You can set the required_hits at your comfort level.

Spamcop will not have any problems with this, and yet you will still get all of the details you need (as headers) to see why a given message was tagged. You should also be sure you are running spamassassin -F0 or something like that if you are running spamc/spamd, since otherwise the FROM: line will be rewritten.
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