[Exim] macro definition priority

hi,

(talking exim 3). if i define a macro in the conf file, and also
define it on the command line when calling exim, which definition will
be used ? (my goal is to provide a changeable hostlist to a
domainliust router, with some sane defaults predefined in the
conffile).

quick scam through spec didn't reveal an answer. Philip, maybe it
would be a good idea to add a sentence about this issue (even if only
to v4's doc :)

thanks,

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