Mail Problem Error 5550

A client has this problem and i do not have experience on mac clients everythig look fine on the mail configuration but every time that he try to send a mail appear this message

'a message in your outbox could not be sent, the server did not recognize the recipients


not local host hotmail.com not a gateway

error 5550


when he tries to send a mail to his hotmail account

 

 

 

 

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