It is very easy to do, you need only to SSH into your server and locate the following file: exim.conf

You should be able to locate the Exim configuration file within your “etc” folder: /etc/exim.conf

Once you have found the exim.conf you will need to open it with a text editor nano or pico will work fine.

pico /etc/exim.conf

Once you have it open you will want to locate the following: (If you are using nano, “ctrl + w” will allow you to search for it)

remote_smtp:
driver = smtp

You will need to add another line just below the “driver = smtp”, adding: interface = xxx.xxx.xxx : xxx.xxx.xxx.xxx

Once added, you should have this:

remote_smtp:
driver = smtp
interface = xxx.xxx.xxx

Make sure you replace the XXX with an IP on your server you would like to use. If you wish to use more than one IP you can separate them with a colon “:” like so:

remote_smtp:
driver = smtp
interface = xxx.xxx.xxx : xxx.xxx.xxx.xxx

Once you have edited the lines to match the above, you will need to save (ctrl + x) and then restart Exim.

service exim restart

Once Exim restarts you should now be sending emails out on the new IP address instead of the primary one on your server.

IMPORTANT NOTE:

If you are a CPanel user, you will need to need to make a slightly different edit than the above. In your conf file you will have lines like this:

remote_smtp:
driver = smtp
interface = ${if exists {/etc/mailips}{${lookup{$sender_address_domain}lsearch*{/etc/mailips}{$value}{}}}{}}

You will need only to remove the “interface = ${if exists {/etc/mailips}{${lookup{$sender_address_domain}lsearch*{/etc/mailips}{$value}{}}}{}}” and replace it to make it match:

remote_smtp:
driver = smtp
interface = xxx.xxx.xxx

The other thing you will need to be careful of, if CPanel makes an update to Exim it will change your settings. So you will need to re-edit the conf files every now and then to keep it running on the IP of your choice. At this time I am not aware of anyway around this, though there is allot of talk on the CPanel Forums.

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One of the most important things in the security of your web server, is a firewall. Software firewalls are in most cases the best solution, as they are both cheap/free and a great defense against unwanted people and traffic. Most linux distros already have a firewall built into the OS, but using the commandline each time you need to make changes is always a hassle and not very user-friendly.

I have great news! There is a free firewall solution that can be easily installed to your linux CPanel/WHM web server and it is the best one out there.

I am speaking of ConfigServer’s “CSF” (http://www.configserver.com/cp/csf.html)

CSF is everything you could want in a gui front-end that directly incorporates into your WHM control panel. Out of all the solutions I have used through the years, this is by far the best one out there. It is extremely easy to use, it incorporates many other modules for extra security and best of all, its FREE!

So why wait, secure your CPanel web server today with the best software firwall.

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