I’ve had this issue myself before and was recently asked by someone else how you can remove old recipients from the auto-complete drop down list that shows up when you start typing an address in Apple Mail. I never really bothered to sort the problem out and rather just worked around it. Now that I’ve figured out how simple it is to clean up this list, it’s probably something I’ll do a little more often…

Two simple steps:

1 – Click on “Window” on the tool bar (while Mail is your active application of course.

2 – Click on “Previous Recipients”

Previous Recipients

Previous Recipients

Now just select the addresses you want to remove (or possibly even add to your address book) an then the “Remove From List” button.

Remove the offensive addresses

Remove the offensive addresses

You’re done.