Setting Up Email Help

When I try to set up email a window pops up saying "blank user name. Type a valid username"

My username is also my email address which I think has something to do with the problem, when I try to change my username to something else it does not allow me and it says username is in invalid email format. Anyone Help?

Have the carrier of yours to correct any provisioning errors on their end and or have them setup BIS properly.

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