email from PhoneNumber@mms.att.net
Suddenly, text messages from another phone are arriving to me are arriving as email from (thatPhoneNumber)@mms.att.net. I upgraded to iOS 5.1 yesterday, but haven't seen anything else odd (that I know of).
Is this a sender problem, receiver problem, or at&t problem?
Suggestions appreciated...
iPhone 3GS, iOS 5.1