To update the Exim mail server on a cPanel server, you will need to use the /scripts/upcp script provided with cPanel. This script will update the cPanel system and all the installed components, including Exim.
Log in to your cPanel server as the root user.
Run the /scripts/upcp script to update the cPanel system and all the installed components:
/scripts/upcp
Follow the prompts to complete the update process. The script will download and install any available updates.
Once the update is complete, restart the Exim service by running the following command:
service exim restart
This will apply the updates to the Exim mail server and make them effective.
Keep in mind that updating the Exim mail server may require a restart of the server. It is a good idea to schedule the update during a maintenance window to minimize disruption to your users.
It is also a good idea to take a backup of your system before performing the update, in case anything goes wrong. This will allow you to restore the system to a previous state if necessary.