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