I have an Exim configuration file that depends on a macro being defined
on the Exim command-line. If it's not defined (e.g. forgetful admin),
I'd like an immediage Exim panic on startup, to ensure no unexpected
side-effects.
Any ideas on how to implement such a panic? It's obviously just a
simple expansion involving string comparison, but what option can I hook
the expansion into?
I'm still using exim-3.36, and probably won't have time to upgrade for
another couple of weeks.
