[Autor-devel] Undelivered Mail Returned to Sender

This is the Postfix program at host ibermpcrimidesa.ibercom.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to <postmaster> If you do so, please include this problem report. You can delete your own text from the attached returned message. The Postfix program <[email protected]>: host 89.6.89.74[89.6.89.74] said: 550 5.1.1 User unknown (in reply to RCPT TO command)