This means that there is a problem with the recipient’s email address. The message will explain...
----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...
This is probably due to your quota being full. You will need to delete some of your mail to make...
Go to cPanel - "Mail" - "Email accounts" Find the mailbox you need and click "Password"....
Go to cPanel - "Mail" - "Email accounts". Complete all of the fields and click “create account”...
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