Different quotas for different virtual domains

["Próspero, Esteban"]

Hi!

I want to set different quotas for the mail accounts of different virtual
domains users. Once set, new users should be "quoted" to its respective
domains quota.

That is: 

domain1.com     5000k
domain2.com     2000k
...

Any idea of how to do it?

Thanks very much in advance!!

Esteban Javier Próspero