Library /sys$common/syshlp/MAILHELP.HLB  —  SELECT  Qualifiers  /FROM_SUBSTRING
       /FROM_SUBSTRING=text

    Selects messages containing the specified text in the From: field
    of the message, where the specified text is usually a node name
    or user name. This command searches only the node name and user
    name of the sender; it does not search the personal name field.
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