Qualifiers

/BUFFER_SIZE
      /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.


/LOG
      /LOG
      /NOLOG (default)

   Displays the name of the new mailbox when it is created.


/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.


/PERMANENT
   Specifies that the mailbox is to be permanent. By default,
   mailboxes are temporary.


/PROTECTION
      /PROTECTION=(ownership[:access][,...])

   Specifies protection for the mailbox.

   o  Specify the ownership parameter as system (S),  owner (O),
      group (G),  or world (W).

   o  Specify the access parameter as read (R),  write (W), logical
      I/O (L),  or physical I/O (P).

   If no protection is specified, the mailbox template is used.

   For more information about specifying protection codes, see the
   VSI OpenVMS Guide to System Security.


/TEMPORARY
      /TEMPORARY (default)

   Specifies that the mailbox is temporary. By default, mailboxes
   are temporary unless you specify /PERMANENT.