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CREATE, /MAILBOX, Qualifiers, /BUFFER_SIZE
 *Conan The Librarian 

       /BUFFER_SIZE=n

    Specifies the number of bytes of system dynamic memory that can
    be used to buffer messages sent to the mailbox. If you do not
    specify /BUFFER_SIZE or specify it as 0, the operating system
    provides a default value from the DEFMBXBUFQUO system parameter.
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