VMS Help  —  MAIL Routines, MAIL$MAILFILE_CLOSE, Description
    If you specify the input item code MAIL$_MAILFILE_FULL_CLOSE,
    this procedure purges the wastebasket folder automatically
    before it closes the file. If the number of bytes deleted by this
    procedure exceeds the deleted byte threshold, the system performs
    a convert/reclaim operation on the file.
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