The value of the Return-Path and the Reply-To in the messages are identical but the headers are different. Is this important?
Perhaps you could just copy the messages to 'spam' and 'ham' IMAP folders, rather than resending them. I think that preserves all headers, and should be less resource intensive. It should work even if the mail originally arrived by non-IMAP means.
I was under the impression that salearn will tokenize any header (even 'Recieved:'), and generally speaking I don't think using a 'resend' feature keeps all the headers.
Sure. They will have really high scores. Most MTAs add 'Received:' headers :)
--Stewart
