Altermime is a small utility that allows you to append a disclaimer to all outbound emails on a cPanel server.

1. Installing altermime

You should be able to copy and paste the following commands in. You’ll need to be root.

cd /usr/local/src/ 
wget pldaniels.com/altermime/altermime-0.3.10.tar.gz 
tar xvfz altermime-0.3.10.tar.gz 
cd altermime-0.3.10 
make 
make install

2. Setup Disclaimer Text

Create two disclaimer files. One is text and the other is for HTML.

Text file

nano /usr/local/etc/exim/textdisclaimer

Add your disclaimer text.

-------------
incredigeek.com

HTML File

Create the HTML disclaimer file with

nano /usr/local/etc/exim/htmldisclaimer

And add your disclaimer HTML to the file. Example:

<p>
-----
<br />
  <a href="http://www.incredigeek.com">incredigeek.com </a>
</p>

3. Modify Exim Configuration

Now that we have the disclaimer files set up, we can move on to configuring Exim so the disclaimer text gets added to every email sent out.

Open up WHM and go to Exim Configuration Editor -> Advanced Editor

A. Configuring Routers Configuration

Find the ROUTERS CONFIGURATION section. We will add some configuration in the “Section: PREROUTERS”

Add disclaimer to Single Domain

Paste in the following to add the disclaimer to a single domain. Replace “incredigeek.com” with your domain.

disclaimer:
driver = dnslookup
domains = ! +local_domains
transport = ${if eq {$sender_address_domain}{incredigeek.com}{disclaimer_smtp}{remote_smtp}}
no_more

Add Disclaimer to Entire Server (Optional)

If you would rather apply the disclaimer to the entire server, use the following.

disclaimer:
driver = dnslookup
domains = ! +local_domains
transport = disclaimer_smtp

B. Configure Transports Configuration

Once we have that added we can find the “TRANSPORTS CONFIGURATION” section and under the first “Section: TRANSPORTSTART” add

disclaimer_smtp:
driver = smtp
transport_filter = /usr/local/bin/altermime  --input=- --disclaimer=/usr/local/etc/exim/textdisclaimer --disclaimer-html=/usr/local/etc/exim/htmldisclaimer
size_addition = 1

That should be everything that you need. Send a test email to an external email account to verify that it works.

Note that it looks like sending an email locally to email addresses on the same domain or to yourself bypass the filter and do not get the disclaimer added.

The following links were helpful for getting this set up.

https://forums.cpanel.net/threads/howto-footer-disclaimer-in-outgoing-mails.98465/

https://pldaniels.com/altermime/