Mail Message Stays UN-Deleted
I have a message in my Inbox in Mail that I have tried several times and deleted but it stays in the Inbox! (see below).
This Inbox belongs to an Exchange account; however, when I go into a browser page to check my Microsoft mail account, the message is not in that box.
It would appear then that the message was deleted in the Exchange account but it still appears in Mail on my Mac.
How do I get rid of this irksome message?
iMac 21.5″ 4K, macOS 11.4