Review for MailClassifier by Jay
Rated 5 out of 5 stars
I've been using this MailClassifier for 6 months now to sort all my email.
It's accurate for 9/10 emails and integrates seamlessly with Thunderbird.
It uses less resources than PopFile, and does not slow down after months of training (unlike my PopFile experience)
Supports POP3 and IMAP seamlessly - something PopFile requires plug-ins for.
I still use the Thunderbird built-in classification for Spam though.
To create your own collections, you must have a Mozilla Add-ons account.