I am creating my mail server and It's Continue to send/receive mails at local server through Exim, but still unable to send/receive mails from another server and show error
LOG: MAIN
<= root@ U=root P=local S=345
[root@localhost ~]# delivering 1QnnHq-0001hB-K2
T: remote_smtp for username@domainame.com
LOG: retry_defer MAIN
== username@domainname.com R=dnslookup T=remote_smtp defer (-53): retry time not reached for any host