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)...
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: click "Mail" - "MX entry", choose "Remote Mail Exchanger". Click "Add New Record"...
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