This is probably due to your quota being full. You will need to delete some of your mail to make room for the new ones.
If this is not the problem check your mail filters and forwarders. If you still have a problem please contact our support team.
----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...
You can do that at cPanel - "Email" - "Email Authentication".
This means that there is a problem with the recipient’s email address. The message will explain...
Go to cPanel - "Mail" - "Email accounts". Complete all of the fields and click “create account”...
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