This means that there is a problem with the recipient’s email address. The message will explain...
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". Complete all of the fields and click “create account”...
Go to cPanel: click "Mail" - "MX entry", choose "Remote Mail Exchanger". Click "Add New Record"...
----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...
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