Official documentation : https://documentation.cpanel.net/display/CKB/How+to+Configure+the+Exim+Outgoing+IP+Address
The /etc/mailips file controls the IP address from which each domain sends mail.
To change specific domain outgoing email IP simply
[cc lang=”bash”][root@sme09 ~]# cat /etc/mailips
*: 103.21.180.182
#dedicated IP for filvacco.com.my
filvacco.com.my: 103.21.180.183
times-lite.com.my: 103.21.180.183
finst.com.my: 103.21.180.183
kuangyik.com: 103.21.180.183
[/cc]
[cc lang=”bash”]
vi /etc/mailips
[/cc]
restart the exim service
[cc lang=”bash”]service exim restart[/cc]