Comment by clogston

> It would also be nice if you could disable spam filtering entirely and run your own client-side.

It's horribly convoluted but it /is/ possible to do so:

http://webapps.stackexchange.com/questions/69442/how-to-disa...

I've been running it this way for about 18 months now after having a few important emails get gobbled up by their spam filter.