How do I unblock an email address in Mail?
I blocked an email address months ago but don't remember how I did it and now I can't reverse it. I'm using Mail, 10.11.6 on my Macbook Pro.
This morning two emails from this person appeared in my mailbox but before I could click on them they vanished so I know they were sent but don't know where they went. How can I unblock this address and retrieve the emails?
MacBook Pro (13-inch Early 2011), Mail problem