I figured the servers were busy...probably still are but oh my goodness this is getting frustrating. I've been trying to add additional emails to iMessage or my Apple ID for the past few days and I keep getting this error message. I've tried to add them via appleid.apple.com but that isn't working either. It's not even returning an error message there. It just doesn't let me save the email. It doesn't matter what email I use, same result. Email won't save. I'm not even at the point where I'm waiting for a verification email! Is anyone else having this problem?