Not much. I like new approaches to messaging.

The idea of having guidelines to receive messages is good, if these are enforced somehow it is better (or not, I don't like enourmous forms with required fields).

Message categorization by the sender instead of the somehow by the receiver is also a great idea.

I don't like the implementation. Implementing good ideas can be much more complicated than conceiving them. In the current state this doesn't qualify as a full-blown messaging app (in fact I don't quite understand what formal does right now). I just wanted to say you could keep thinking of alternative implementations/integrations of your basic ideas (and come up with more).