My Note 3 reopens previously read emails as unread (blue). I have 3 accounts, 1 POP3 and 2 server based email accounts, only the POP3 fails. I have used this same setup in my last 3 phones, Samsung Charge, MAXX and now a Note 3, only the N3 has this issue. I have verified that reopened emails do not exist on my Comcast server. This usually occurs multiple times a day sometimes with new, valid unopened emails, most of the time there are no new emails. They are usually about a week old.