SMTP Error 550, Recipient address rejected

An Email was sent to z@hansaplus.com by info@hansafactory.com, and Error message “SMTP Error (550): Failed to add recipient …: Recipient address rejected: User unknown in virtual mailbox table)” is shown.  But the email is correct. Finally it is found that both domins are in the server. And HansaPlus Mail server is applied in addtional mail …

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