I cannot send e-mail and when I do I get a warning that says "Authentication failed. Please verify your username/password.". If I login on the AT&T website (on my PC) with my e-mail address and password it works fine. On my phone it does not work fine. I am using IMAP Protocol for my domain...

I setup my email to sync to my inspire and I now get two different notifications for the same email address what did i do to create this, how do i fix it? thanks