Im on my fifth day with my new iPhone 3GS (upgraded from first-gen iPhone), and I've been experiencing some difficulty with Mail. First of all, when I upgraded the phone to 3.0, all of my four email account passwords disappeared. So I went under Settings, reentered the passwords, and all seemed well. I was able to receive and send email. Now, for some reason I can't send email! An error message pops up saying "No password entered," and I've already triple-checked under Settings to ensure that my passwords are entered. Can somebody point me in the right direction?