This is probably due to your quota being full. You will need to delete some of your mail to make...
First make sure that you are current with your invoices. If that’s not the problem, make sure...
Go to cPanel: click "Mail" - "MX entry", choose "Remote Mail Exchanger". Click "Add New Record"...
Go to cPanel - "Mail" - "Email accounts" Find the mailbox you need and click "Password"....
----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...
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