[Users] Bogofilter asking to be trained - again.

[Graham P Davis]

This message has been popping up occasionally during the past week:

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The Bogofilter plugin couldn't filter a message. The probable cause of
the error is that it didn't learn from any mail. Use "/Mark/Mark as
spam" and "/Mark/Mark as ham" to train Bogofilter with a few hundred
spam and ham messages.
----------

Why, after years of successful filtering, should it suddenly start
throwing up this warning?

-- 
Graham P Davis, Bracknell, Berks.
OS: Linux: openSUSE Tumbleweed (64-bit); KDE 4.14.6; Kernel: 3.19.3