Q. When I write emails to colleagues and friends after typing the first several letters of the email address on my Mac using the Mail app, the program automatically fills in the balance of the address. I have 20 years of history of email, and often the address used is no longer the correct one. How do you get rid of old addresses?

A. When some of the email addresses in the Mail program’s memory become obsolete, you can prune the outdated entries or update them on the spot. In the Mail app, go to the Window menu and choose Previous Recipients. The Previous Recipients box opens with a list of addresses you have used for earlier messages.

To delete an old address, select it and click the Remove From List button in the bottom-left corner of the box. To select multiple names for removal at once, hold down the Mac’s Command key and click through the list.