Library /sys$common/syshlp/mailhelp.hlb MAIL, Qualifiers, /SELF  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SELF
       /NOSELF

    Determines whether Mail sends a copy of the message you are
    sending to you. The default qualifier is /NOSELF unless you have
    used the SET COPY_SELF command to specify that copies be sent to
    you automatically. The /NOSELF qualifier overrides the SET COPY_
    SELF SEND command.