Remove previous recipients in Apple Mail
To remove previous recipients in Apple Mail follow the instructions below:
- In Mail.app, under the Window menu, select: Previous Recipients. A list of all previous recipients will come up. Those that are already in your address book will have the little Rolodex icon next to them.
- Select an address that you want to remove, then click Remove From List.
This removes addresses that you do not want to show up when Apple Mail autocompletes.