Sometimes your server’s IP address may get black listed by most of RBLs. In such situation a quick solution is to route the emails through a secondary IP address on the same server which is not black listed. There are two options to switch the mail server IP.

1. In Cpanel:

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
vi /etc/mailips

and add:

*: newIP

Restart exim

or

2. Through Shell

vi /etc/exim.conf

Locate remote_smtp

Change as per below:

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 = 111.222.333.444 # Change to your server IP address.

Save changes and exit.

Restart Exim