cPanel allows you to easily create custom Exim filters by simply dropping the rules in /usr/local/cpanel/etc/exim/sysfilter/options/ and running: /scripts/buildeximconf service exim restart Here are a couple useful examples of filters we’ve created for our customers: Prevent email delivery to certain domains: if (“$h_to:, $h_cc:” contains “@domain.com”) or (“$h_to:, $h_cc:” contains “@domain.com”) then fail text “Emails to…