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When sending email I receive an error message.

This means that there is a problem with the recipient’s email address. The message will explain the problem; normally "Receiver does not exist."

You can do that at cPanel - "Email" - "Email Authentication".

First make sure that you are current with your invoices. If that’s not the problem, make sure...

Go to cPanel: click "Mail" - "MX entry", choose "Remote Mail Exchanger". Click "Add New Record"...

----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...