Have you ever gone to send an email in OS X, and when you start to type the person’s name all their past 5 email addresses come up, even though you have deleted them from Address Book (Contacts App)? Where are the addresses coming from and how do you get rid of them?
Apple mail on the mac keeps track of every person you have received an email from. This makes it easy to send them an email even if they are not in your address book. But this feature becomes a pain when people change their email address and Apple mail remembers the old one. It’s simple to fix though.
To delete a person’s old email address, in Mail go to ‘Window’ menu and ‘Previous Recipients’.
Then click on the old email address and press the ‘Remove from List’ button.
You should do this anytime someone sends you a ‘my email address has changed’ email.