EMAIL ALERT ERROR

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I have an error message 503 2008.04.23 15:57:18 Mail: 553 5.5.4 ... Domain name required for recipient address I have all the details of the SMTP added I have login, password everything added cant work this out has anybody got a clue? I have tried serveral oth eraddress same error Thanks
 

Set mail parameters, press OK.

Turn off client terminal.

Launch client terminal and try to use mail.

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