I'm just wondering a few things about the new domain wide quotas:
Are these quotas implemented in vdelivermail?
Or are they implemented with system quotas?
Will I still be able to use maildrop to filter my mail?
I addresses the above questions in README.quotas. Please take the time to read it before posting to the list, that's why I took the time to write it.
When are the quotas recalculated? (If maildrop deletes a message, will it throw the quotas off?)
It calculates based on maildirsize files, which greatly increases performance. (Brian's original implementation used a du like function that delayed delivery by as much as several seconds). So it does follow the Maildir++ standard, it's just a cumulative approach.