Yettwasezmel 4 ɣef 5 n yetran

sɛur Arjan di Oct. 9, 2015 · aseɣwen yezgan

Just installed, and immediately proved it's working on the first spam message received.
Only downside is that it will display its classification errors in classic view only. I use the Thunderbird Conversations addon, and the warning about spam doesn't show up there.
Nevertheless, a good add-on.