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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."

----- 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...

Your website content includes mail. It’s up to you how much space is used for mail. 100% if you...

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

Go to cPanel - "Mail" - "Email accounts" Find the mailbox you need and click "Password"....