How to block emails from a specific address using Exim

How to block emails from a specific address on a cPanel/WHM server using Exim ?

This is fairly easy to achieve with Exim.
First you’ll need to find the system filter file for Exim. This can be found out through WHM >> Main >> Service Configuration >> Exim Configuration Editor.
Towards the middle of the page, under the section ‘Filters’ , you ‘ll find the path to the file.
Open that file via SSH using your favorite editor and add the following to it :

    if first_delivery
    and ( (“$h_from:” contains “emailtoblock@domainname.com”)
    )
    then fail
    endif

If you would like a copy of the email to be sent to you after the message fails, use the following code :

    if first_delivery
    and ( (“$h_from:” contains “emailtoblock@domainname.com”)
    )
    then
    unseen deliver “youremail@yourdomainname.com”
    fail
    endif

Make sure that you substitute the correct email addresses in the above code.