This is probably due to your quota being full. You will need to delete some of your mail to make...
Your website content includes mail. It’s up to you how much space is used for mail. 100% if you...
Go to cPanel - "Mail" - "Email accounts". Complete all of the fields and click “create account”...
----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...
You can do that at cPanel - "Email" - "Email Authentication".
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