I can no longer send e-mail from my Hotmail (recently converted to Outlook) e-mail account on my I-phone3SG.  As per info on the web I tried erasing and then re-entering the password for the outgoing mail server.  That worked for a bit - the test e-mail I had sent came through, but then I lost the ability to send again, and re-doing this"fix" did not work again.