How to change exim mail interface IP :
Login to WHM >> Exim Configuration Editor >> and check the below.
Automatically send outgoing mail from the account’s IP address instead of the main IP address. Warning: If you turn this setting on you should make sure reverse DNS entries match the ones in /etc/mail_reverse_dns.
Login to SSh
vi /etc/mailips
* :new_IP_address
For example :
root@server [~]# cat /etc/mailips
* :10.10.10.5
root@server [~]#
vi /etc/mailips
domain.com:IP address
# To send the email out from the particular IP for domain.com.
New cPanel requires
vi /etc/mailhelo to be changed as well. See below example
**********************
domain.com : domain.com
*: server.arun.net
*********************