the user does have to train it, but that training can be done in any number of ways.
Popfile is just getting an IMAP module that lets you train (and correct) the filter by just moving messages to the folder they are supposed to be in.
this sort of multiple access is one of the big advantages of IMAP (although I will admit that not that many people take advantage of it). unlike the other options you don't even have to have the various pieces on the same machine.
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