Modifies the informational record of an indexed mail file,
    including the mail file name, the default mail file name, and
    the wastebasket name.

    Format

      MAIL$MAILFILE_MODIFY  context ,in_item_list ,out_item_list

  Additional Information (explode) :

• Returns
• Arguments
• Input Item Codes
• Output Item Code
• Description
• Condition Values Returned