You can do that at cPanel - "Email" - "Email Authentication".
This means that there is a problem with the recipient’s email address. The message will explain...
----- The following addresses had permanent fatal errors ----- (reason: 550 ... User unknown)...
In order to have access to your personal email from any computer, you have to use one of the...
This is probably due to your quota being full. You will need to delete some of your mail to make...
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