Cannot send email to one Customer but other servers can?

xanadu

Active Member
Sep 25, 2006
27
2
153
A user has one client in China to whom emails from his cPanel server get rejected BUT he can send emails from other email services, such as his ISP email address, and they are received by the Chinese Customer.

Typically the error message is 'timed out'.

I have thoroughly checked all DNS records involved but can't find the answer?

Can any body help please?
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,909
2,228
463
Hello,

Try to connect to that remote mail server's IP address from the cPanel server's command line via telnet to see if it fails. EX:

Code:
telnet IP 25
If so, it's possible a firewall rule is blocking the connection (either on the cPanel server or on the remote mail server).

Thank you.