Hi, this a negative request, a request for something not to do, but I thought it would be useful in this moment.
I would like the developpers not to hasten, and to opt for lean and clean whenever possible. Personally, Pegasus 3 was already satisfactory for me, i.e. it did send and receive emails.
I think the worst would be adding piles of features that are not necessarily connected with emails. The best would be hundreds of small improvements to what already exists. Well, do your best, anyway.