Hi, I just check it
it can't work from the Panel without edit of files ?
(the reseller an change the IP per domain and use the domain IP's for domains emails)
It would be easy enough for you (or I) to add the code to exim.conf; that would require that the file exist. It wouldn't require that the file be populated; only that it exist.
That's easy enough; the harder part is populating the file. That could be done by the post creation script.