I have a bunch of iPhone 6 phones that are replacing some iPhone 5's. The iPhone 5's were working and still are but when I configure the iPhone 6 with the same settings as the 5 it takes and confirms them as correct but then doesn't receive email. The iPhone 5 using the same account is OK. The iPhone 6 can send email but can't receive any.
I've configured the iPhone 6 to use an account on another SBS2003 server and that works fine so that would imply that it's not the phone. Puzzling that the iPhone 5's are working OK but the 6 doesn't on the same server.