This is the app
http://www.lonelycatgames.com/?app=profimail
I had some email exchanges with them but they were banal one-line responses and when I somewhat less than politely suggested that the person actually asks the developer (who is presumably in the office next door) they stopped replying totally 
The app would be handy because it supports default BCC and server deletion, and other stuff.
They say it supports Symbian 3rd and 5rd Ed, ^3, Anna. So why not Belle? Is it really that different?
One thing I have seen in "older" apps is that when you try to scroll a menu (which has scroll bats, due to being too long) you end up activating the first menu item touched, which is obviously less than great. With some finger trickery (holding a finger on the menu for a bit and then scrolling it) it can be made to work OK however.
