We've had quotas enabled for some time now, but purposely set it so that we will always accept new email for a user and never deny due to database size. We send the automatic "reminder" emails to users everyday when they approach their quota warning and again after they exceed their quota. Once exceeded, standard users cannot add to their mail database, such as calendar entries or save sent emails. This works well to keep users under quota.
However, users that replicate their mail database seem free to exceed their quota. They can create calendar entries and save sent emails all they want since it's a local replica. Besides the annoying the emails they get saying they are over quota, they have no other motivation to cleanup so we now have users that are 9x the quota. Is there a better way enforce quota for users that replicate?