OS 10.12.6

I always use apple mail but for the first time, the in box shows (1) new email but it isn't there! I tried shutting down the mail and reopening it. I then went to bell mail and it also shows (1) inbox but again there is nothing there. I have never encountered this before. I'm expecting an email (from imgur) and I wondering if that is the one.
Has anyone had this problem?

jaybass


OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD