I love mox and was at your talk. I've been using it for a year. If I could make a few small feature requests (which may already exist) - I'd love to be able to use my external spamassassin with it instead of (or even in addition to) the built in one.

Secondly the documentation/instructions could be clearer for non-typical use cases, for instance catch-all emails. I have an Exim server with two domains pointing to it, I have catch alls on both, but the second domain is delivered into a folder in the first (it's used similar to SimpleLogin - for signing up to services). I assume this is possible with Mox but I'm not sure.

Having said that, I love Mox and I'm slowly moving all the email I host for other people onto it because it just seems to work.