To make sure that everything is 100% in agreement with DNS Report , I need to be able to turn ON domain literals.

I am running the latest version of Exim 4.x on Cpanel.

When I turn on (ie unhash)
"local_domains_include_host_literals"

And do
"service exim restart"

I get the following error
"Starting exim-smtps: 2003-08-22 09:15:09 Exim configuration error in line 127:
main option "local_domains_include_host_literals" unknown"

Any pointers, please?

Exim 4 doesn't support "local_domains_include_host_literals"

You can replace that with "allow_domain_literals = true". According to the exim documentation you also need to add @[] to your local domains list as referenced in the local_domains.

Exim will restart without errors, but according to DNS reports is still doesn't accept the literals

Would be interested in seeing if you have solved this one.