Sent emails should not appear when Unread filter is used.
The Unread email link in the left menu, clicking this displays unread emails, but it also displays Sent emails - I'm not sure why this occurs as all sent emails have been read, as I'm the sender!
Rick Reno commented
You have an "unread" option, but when I click on it it brings me to all my SENT messages, which are, of course, unread. Bad design. Allow the sent folder to be excluded from Unread sections.