Email problem...

i have 3 emails set on iphone... 1 icloud , 3 gmail accounts... till last night... today morning 1 of accounts started saying "username or password incorrect"... password fine , works on gmail, refuses work on phone... have deleted account , added again... still same... don't know problem is... can please me...?

 

i use bt yahoo server on iphone 4.

error message dismiss know correct.

after dismiss fine mine.

 

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