email-only user disk quota

I have a server at Rackspace with about 20 "mail-only" users.

I was just wondering if anyone has any suggestions on how to limit email disk space usage? I've seen it done on my own ISP and Hotmail for instance. Basically, I just want it so people trying to send 5MB emails will get bounced. Currently, there is no quota.

Any suggestions are appreciated.

Thanks.

 

 

 

 

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