[Exim] question on case in lookups.

is there a definitive list of what variable are lower case when? For
instance, if I rcpt to: jetmore@???, $domain is cinergycom.com
in the ACLs. Just got bitten by this (well, actually, only kinda - I was
jaded by not having to use ${lc: on domain lookups and was expecting the
addresses in recipients_list to be lower case in local_scan also) and was
wondering about other variables I should be careful with.

Thanks
--John