Right...
As I said, there aren't any worthy alternatives. You can try Flexmail, IMHO its not enough but you might like it better than I do.
http://www.webis.net/products_info.php?p_id=mail
*EDIT: The MOMAIL addition is new to me, I just noticed it & it wasn't around last time I used FM 4 so it may improve on some apsects of Flex.