SetUserMailboxMaxSize()
From Rackspace Email & Apps API
This function will set how much of a domain's available allocatable storage should be used with a particular mailbox.
Input Parameters
Four strings, one integer:
Administrative username, Administrative password, Domain name, User name, New max mailbox size (int, MB of domain storage will be reduced by (new size) - (default size))
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.