Use cPanel advanced exim configuration editor and add this line in the top editing panel:
Code:
hostlist permitted_hosts = /etc/exim_permittedhosts
In the middle of the 3 central editing panels, modify this part of the text from:
Code:
accept domains = +relay_domains
warn message = ${perl{popbeforesmtpwarn}{$sender_host_name}}
hosts = +relay_hosts
accept hosts = +relay_hosts
to:
Code:
accept domains = +relay_domains
warn message = ${perl{popbeforesmtpwarn}{$sender_host_name}}
hosts = +relay_hosts : +permitted_hosts
accept hosts = +relay_hosts : +permitted_hosts
Now, create the file /etc/exim_permittedhosts and add IP addresses of any hosts that you want to be allowed to relay without authentication (in your case 62.242.18.206), one per line then restart exim.