[exim] reverse_host_lookup exception list

I would like to integrate :

require verify = reverse_host_lookup

as it has stopped SPAM tremendously. My concern is I have a couple users
of the system who log into their email, then send but fail this lookup
as they are on static IPs without PTRs set (I don't know why, I just
need to deal with it)

My question is, is their a global variable list of logged in IPs which I
can utilize to place an exception on the above lookup?

Thank you!