[Exim] Per user quota?

Folks,

    I'm currently using exim's quota option to limit the size of user's
mailboxes. (I have read the caveats in the doc that the OS is the better
place for handling this, but in the past this has caused some other
problems.) The exim docs say that the quota option type is a string,
which can be expanded. That being the case, can I set up certain users
with different quotas by adding a lookup as follows:

in configuation:

quota = file; /usr/local/exim/quotafile

in quotafile:

someuser1 4M:
someuser2 4M:
* 2M:


If this works, do I then need to provide the same lookup to the
quota_warn_threshhold option?


Thanks,

Chris Caswell
NCREN