/sys$common/syshlp/MAILHELP.HLB
DIRECTORY, Qualifiers, /TO_SUBSTRING
 *Conan The Librarian 

       /TO_SUBSTRING=text

    Selects messages containing the specified text in the To: field
    of the message, where the specified text is usually a node name
    or user name. The /TO_SUBSTRING qualifier will not search the
    personal name field.
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