Cant receive emails from external servers

[jimmy31]

Hi,
I have a problem with my mail server, I cant receive any email from external servers, but I can send them out, however I can send and receive them locally on the server. Everytime I send an email to [email protected] I got mailer deamon message like this

"Delivery to the following recipient failed permanently:

[email protected]

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at
550 5.1.1 http://mail.google.com/support/bin/answer.py?answer=6596 k8si877004icw.21 (state 14)."


I did smtp test with mxtoolbox, and it showed me "Warning - Reverse DNS does not match SMTP Banner". Anyone know what could be wrong in my Cpanel? Thanks in advance.

 

[cPanelTristan]

Do you only have access to webmail and cPanel on the machine without access to the backend via root SSH or to root WHM? If that is the case, your hosting provider will need to troubleshoot the issue.

 

[jimmy31]

I think I have access to backend via root SSH, although I've never use that thing... there is some SSH/Shell Access icon under Security tab and there are no keys installed, should I install one?

 

[cPanelTristan]

cPanel wouldn't allow root SSH access but only cPanel account user SSH access if available there. Do you have a root password for WHM access? You would need root access to get to SSH to perform any email troubleshooting. The first step to knowing if you have root SSH is having root WHM access where the username you use to log into WHM is root