Library /sys$common/syshlp/helplib.hlb  —  CREATE  /MAILBOX  Qualifiers  /MESSAGE_SIZE
       /MESSAGE_SIZE=n

    Specifies the maximum size (in bytes) of a message that can be
    sent to the mailbox. The maximum value is 65535. If you do not
    specify /MESSAGE_SIZE or specify the value as 0, the operating
    system provides a default value from the DEFMBXMXMSG system
    parameter.
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