The mail server could not deliver mail to mailadress@gmail.com. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.

All of sudden emails are getting bounced with below bounce back messages on the cPanel server as below -

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its

recipients. This is a permanent error. The following address(es) failed:
mailadress@gmail.com

The mail server could not deliver mail to mailadress@gmail.com. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.

Solution :-
 
Inappropriate/wrong resolver (/etc/resolv.conf) configured has caused this issue, when I changed it emails started working.

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