In Mail, go to the Window menu, down to Previous Recipients, and open that. (I
think that's what it's called). You'll find a simple window: a search field and
a table of past mail recipients. Find any you want gone, and delete them. I
don't recall if just the delete key works, or if you need
Using the latest version of MacOS, how do I get rid of old email addresses that
pop up when I go to compose a new mail message? I checked the contact, and the
correct email address is the only one showing, but when I create a new email
message, I’m given the choice of the old address, as well
