> Of course, Gmail and the other big providers have their own ML solutions that > seem to be pretty good, though they have an enormous user base and > near-infinite resources...
I would argue, in contrary, that Gmail performs rather poorly, I have at least one FP a day and that is a big no no. A couple of FN are not a problem, but if I miss an important message because it was classified as spam, I would be really unhappy. So as a result, I have to check the spam manually. It is not efficient! Olivier