Help me Filter Mail unopened by Exel ???

Help me Filter Mail unopened by Exel ???
I want manage some opened And a columm include some unopened. Like below picture, Help me, Thanks All

==> https://c2.staticflickr.com/2/1699/2...12d3349c_o.png

Can you assume that if there is nothing in the OPENED MAIL column that it was not opened?
Assuming Col F is where you want to see the "UNOPENED" and Col E contains the email addresses, then
a formula in Column F could say something like:
=IF(E4<>"","","UNOPENED")