MAILHELP.HLB  —  READ  Qualifiers  /SINCE
       /SINCE=date

    Selects all of the mail messages received on or after the
    specified date. The format for the date is dd-mmm-yyyy. If
    you do not specify a date, Mail selects all of the mail
    messages received on the current day. You can also specify the
    keywords YESTERDAY and TODAY. For example, the command READ
    /SINCE=YESTERDAY would select all mail messages received since
    yesterday.
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