[exim] User Quota Notification

Hey everyone,

A quick question about exim, is it possible to notify the mailbox
destination that there quota us filling up? For example if a user has a 10Mb
quota and they hit 8Mb I want to automatically dispatch them a message
saying their mailbox is almost full and they should do something about it.
If I cant do this through exim Im assuming I can do this through a third
party script?

Let me know!

Thanks!