IPhone :: ALIAS Mail Account Name Is Telling That The Password Or Account Name Is Incorrect?

All of a sudden, my Alias mail account name is telling me that the password or account name is incorrect.So I go into SETTINGS as the button appears for it, and I hit it check all the settings and the settings are fine, nothing has changed. I have not had this problem in over 5 years! Is this a symptom of iCloud going full, taking over MobileMe? I cancelled my MM account 3 months back and have not had any problems. Why has this problems suddenly started appearing? I was looking at the mail in the ALIAS account from the alias account. Now I am looking at it through my main account, which is also reacting slowly due to this problem.