Start Mail and enter the Mail Preferences by clicking the Mail menu and selecting Preferences.To configure this feature in Mail, follow the following steps: This is similar to the default behavior in Microsoft Outlook.įor example, you could start typing 'Joh' and Mail would show you a list of all the users on campus with the first name John.Įxample, typing 'Truman' shows all addresses with Truman in the name: You can configure Mail for Mac OS X to automatically complete e-mail addresses when you are composing a message. Configuring automatic address completion in Mail for Mac OS X