CentOS running Exim 4.63(inc latest fixes).
I want to configure exim to not listen on the external IP, only localhost so that exim can only be used from the server itself (no remote connections).
What's the config option for this setup?
The option you want is
local_interfaces in the main part of the configuration. Section 13.1 of the spec gives some examples, and the full definitions of the option is in the alphabetical list of main options (which I can't directly link to because it doesn't have an anchor).
local_interfaces = 127.0.0.1
define interface parameter under transport section to localhost in main co