/OVERDRAFT=value
       /NOOVERDRAFT

    The /OVERDRAFT qualifier specifies the amount of message storage
    by which the new account can exceed its message storage quota. If
    the account is currently using less than its storage quota, then
    a new message can be stored provided that it will not result in
    the account's storage exceeding the sum of the its storage and
    overdraft quotas.

    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 /NOOVERDRAFT qualifier is equivalent to /OVERDRAFT=0 and
    specifies that the new account has no overdraft quota.

    The maximum value is 4 gigabytes minus 1. If the value specified
    exceeds the maximum, the value is set to zero (no overdraft
    quota).