Automatically copy incoming/outgoing emails to another mailbox in EXIM

1. Login to server via SSH

2. Goto: /usr/local/cpanel/etc/exim/sysfilter/options/

3. Create and Exim filter and give it a name, say ‘myFilter’

4. add the following code in ‘myFilter’:

if (“$h_to:, $h_cc:, $h_bcc” contains “yourdomain.com”)

then
  unseen deliver “backup@yourdomain.com”
endif

if $sender_address: contains “yourdomain.com”
then
unseen deliver “backup@yourdomain.com”
endif

5. Enable the new Exim filter by loggin in to WHM->Exim Configuration Manager > Basic Editor > Filters.

6. Scroll down a bit where you’ll see “Custom Filter: X” where X is the name of the custom filter file you created.

7. Now set it to “On” and click “Save” which will save the settings and the server will automatically restart the Exim service for the changes to be effective.