I am not sure what does this flag means in Spamassassin score checking? My test returned "1 of 5" and mentioned this:
1.0 AWL AWL: From: address is in the auto white-list
migrated from stackoverflow.com Sep 24 '11 at 15:14
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According to the beautiful Wiki entry it is:
So the sender of your mail in combination with the IP was responsible for a high volume of Spam on your system.