mailbox size limit

Hello,

I want to limit the sizes of the mailbox on a per user base. Using quota 
doesn't work since I also use qpopper and it wouldn't be able to create 
the lock-file if the mailbox is more than half full. Is there a 
possibility to do this with procmail? Something like:
do only deliver Email if mailbox_size < 20 MB. Else bounce the mail.

Thanks,
Raphael

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