How to change Cpanel's Mail Server IP Address

[SharkSpace_Scott]

There are two options to switch the mail server IP in Cpanel.

Option #1

Login to WHM

Click Exim Configuration Editor

Check the box next to:
"Send outgoing mail from the ip that matches the domain name in /etc/mailips (*: IP can be added to the file to change the main outgoing interface)"

Save Changes

Then edit the file /etc/mailips
nano /etc/mailips
from shell and add:

*: ReplacewithnewIP

Restart exim

service exim restartOption #2

Login to Shell

Access the Exim configuration file:
nano /etc/exim.confLocate remote_smtp

The default setup will look like:

remote_smtp:
driver = smtp
interface = ${if exists {/etc/mailips}{${lookup{$sender_address_domain}lsearch{/etc/mailips}{$value}{}}}{}}
helo_data = ${if exists {/etc/mailhelo}{${lookup{$sender_address_domain}lsearch{/etc/mailhelo}{$value}{$primary_hostname}}}{$primary_ho stname}}Change to:

remote_smtp:
driver = smtp
#interface = ${if exists {/etc/mailips}{${lookup{$sender_address_domain}lsearch{/etc/mailips}{$value}{}}}{}}
#helo_data = ${if exists {/etc/mailhelo}{${lookup{$sender_address_domain}lsearch{/etc/mailhelo}{$value}{$primary_hostname}}}{$primary_ho stname}}
interface = 11.1.1.1.1 # Change to your server IP address.
Save changes and exit.

Restart Exim

service exim restartCpanel may overwrite these changes during an upgrade. This method is normally for a temporary change until you resolve issues with blacklists, etc. on the main IP.