[exim] pop-before-smtp auth with Exim

Hello,

I'm trying to instruct Exim to allow users to relay if and only if they
are in my pop-before-smtp database.

pop-before-smtp generates a /var/db/smtpaccess.dat file

Back when I was using DRAC, the line I used in Exim was
hostlist relay_from_hosts = net32-dbm;/var/db/dracd.db

However, this doesn't seem to work for my .dat file. I'm having
trouble finding the appropriate parameter for the pop-before-smtp file.
Has anyone has any experience using Exim with pop-before-smtp?

===================
Michael Jeung
mjeung@???