Why was Email Returned with these errors: 550-Verification failed and/or 550-unrouteable mail?

If you receive a message from an Alentus SMTP server, NS103.zabco.net for example, saying it is from "The Postfix program" and giving error code 550, then there is a problem with the receiving mail server being incorrectly configured. Unfortunately there is nothing that Alentus can do in this case. Contact the intended recipient through other means and methods and inform them of the problem. 

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