[exim] which config file is being read?

Hi,

Im running exim 4.69 on FreeBSD and Im trying to correct a problem with a
mysql statement that is being broken by an email address with a "'" in the
local part. But I dont think that its reading the config file that is listed
in the rc.d start/stop script as changing the config (including
intentionally breaking the sql statement) isnt changing the behaviour of
Exim (or breaking exim). How can I check which config file is being read or
force a specific file to be read?

thanks for any tips, Andy.