GetMailAllotStorage()
From Rackspace Email & Apps API
This function will report the total extra storage associated with a domain.
Parameters
Three strings, one result integer:
Administrative username, Administrative password, Domain name,
Total extra storage for the domain (integer, MB, a total of storage allocated and not allocated to users)
Return Values
If successful, the return value of the function will be 1.
Consult the Result Code Table for a list of result codes and their meaning.