[exim] including additional config

Hi,

I have a few servers that I'd like to use a default Exim config file
for. But some of these servers need a few values to be different,
e.g 'server A' will have recipients_max set to 50 and 'server B' will
have it set to 250 .

I see that I can include another config file

http://www.exim.org/exim-html-current/doc/html/spec_html/ch06.html

so if I have a default value for recipients_max=50 in the main
Exim.cong file, but then add another value for it to be 250 in an
included file, which one will take preference?

Or is there a better way of achieving this?

Thanks

Oliver