[Exim] list for determining quotas

Exim 4.14 with courier-imap 1.7.1 from the FreeBSD 4.7 ports.

I need to make a list of users that will have quotas imposed, the rest
will not. What are some ways to do this?
I can use either file system, exim imposed, or deliverquota - so any and
all suggestions would be appreciated.

Whatever I end up using will be posted back to the list if people so
desire.