[kklimonda]

It's pretty good, especially after I've trained it with enough spam & ham emails to turn on its personal ruleset - probably not as good as Google spam filter, but at least I have some visibility into why given message was misclassified.

[Posibyte]

Additionally, you can read the email's source transmission. That way you can read the SpamAssassin headers and see exactly why it was flagged ham or spam. It's been a pretty indispensable tool for email testing for my personal projects for how nifty it is.