/QUOTA=value
       /NOQUOTA

    The /QUOTA qualifier specifies the account's message storage
    quota. The account can continue to receive new messages so long
    as the storage consumed by its currently stored messages does not
    exceed its message storage quota. See also /OVERDRAFT.

    A quota value of zero, as specified with /NOQUOTA or /QUOTA=0,
    conveys unlimited storage. That is, to grant an account unlimited
    storage set its quota to zero.

    By default, this quantity is specified in units of kbytes;
    however, the SET STORAGE_UNITS command can be used to change
    the units used.

    The maximum value is 4 gigabytes minus 1. If the value specified
    exceeds the maximum, the value is set to zero (unlimited quota).