/OVERDRAFT=value
       /NOOVERDRAFT

    Change the account's overdraft quota which is the amount of
    message storage by which the account can exceed its primary
    message storage quota. 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 specifying
    /OVERDRAFT=0 and indicates that the 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).