I have a Samsung Epix and I don't like the Xpress mail that ATT offers, nor do I like the built-in client; it keeps getting an error when trying to send, only after a few successful attempts. Any input would be very appreciated..
I like flexmail, but one caveat is that it is not compatible with the epix notifications patch. You won't get consistent notifications of emails if the phone is asleep. I'm using phonealarm, which works well as a workaround.