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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."

In order to have access to your personal email from any computer, you have to use one of the...

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

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

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