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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)...

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". Complete all of the fields and click “create account”...