FINALLY a great email app, and FREE?

After struggling with using 3 different email apps depending on what I needed to do, I found this one, the only one I need -- and it has more functionality than the others combined.

I would gladly pay $$ for this app, but hey, its free. How do I "contribute"?

I know, you think this is a review by the developer or friend, but it is not

Northbeacher about Envelope - Unified Inbox Email