sa-learn doesn't recognize mbox format

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http://serverfault.com – I am new to spam assassin and like to learn from all the previous mail I manually put into a spam folder. I use Communigate Pro as my mail server on a debian system. simpson:/var/CommuniGate/Accounts/homer.macnt# sa-learn --progress --mbox --spam Spam.mbox Learned tokens from 0 message(s) (0 message(s) examined) simpson:/var/CommuniGate/Accounts/homer.macnt# head -15 Spam.mbox From <>(S_____________-000000000001) 21-03-2012_14:59:08_ Return-Path: <[email protected]> ...snip... with ESMTPA id 425297899 for [email protected]; Wed, 21 Mar 2012 15:59:09 +0100 From: "Ja (HowTos)