Remote host said 554 delivery error!?

hello i tried to reply my broth,who recently;think yesterday?? created a yahoo account and mailed me on that regards. but its saying:"Failure Notice" with "Remote host said: 554 delivery error: dd This user doesn't have a yahoo.com account (XXX@yahoo.com) [-5] - mta1433.mail.mud.yahoo.com... show more hello i tried to reply my broth,who recently;think yesterday?? created a yahoo account and mailed me on that regards. but its saying:"Failure Notice" with "Remote host said: 554 delivery error: dd This user doesn't have a yahoo.com account (XXX@yahoo.com) [-5] - mta1433.mail.mud.yahoo.com [BODY]
what to do? he said that he was unable to log in today.. please help us! he told me that he changed his FB primary Id to his new ID. and he accessed it!
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