One common error you can get when sending email is the "550 No Such User here" error. This error occurs when the sending email is rejected because the username cannot be found or is not accessible by the server. There are several reasons why you would get a "550 No Such User Here" error.
1. The email address was typed incorrectly.
2. MX records are incorrect ( pointing to the wrong server ).
3. Mail file permissions are not readable or are incorrect.
All our servers store email in the "mail" directory of the "home" folder of your cPanel account. If the file permissions are corrupted ( sometimes caused by server moves, back up restorations, or recently uploaded files through FTP, etc.) you will get this error for all your emails. This is a simple fix. You can run the following from command line:
[root@vps#### ~]$ fixperms userna5
This will reset all your file and folder permissions to folders 755 and files 644 for teh cPanle user userna5. If the email bounce is coming to you when you send to another server and it's permissions related, the person you are emailing will need to contact their hosting provider to fix the permissions on their end.
Email does not route correctly ( Remote / Local domains ).
Check the MX entry on the cPanel check the selection and try to change it to "remote".
Thank you,
