Below are the settings present on the server :-
The system currently forwards mail for “root” to “email@example.com”.
The system currently forwards mail for “cpanel” to “root”.
2016-08-30 02:45:48 1beNoq-0002Ca-Th <= firstname.lastname@example.org U=root P=local S=666 T="lfd on myvps.myhostname.com: WHM/cPanel root access alert from xx.xx.xxx.xxx" for root
2016-08-30 02:45:48 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1beNoq-0002Ca-Th
2016-08-30 02:45:49 1beNoq-0002Ca-Th ** email@example.com R=fail_remote_domains: The mail server could not deliver mail to firstname.lastname@example.org. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.
2) Make sure that server's hostname myvps.myhostname.com entry is present in the /etc/localdomains file.