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Is there someone you have emailed that you don’t email anymore, or perhaps they have a new email address? Yet, when you try to send them an email using Mail on Mac OS X, their old email address continues to pop up when you start typing their new address. Well, you can easily remove that old email address from Mail so that it is not a problem anymore.
  1. Type the email address in the “To” field.

How to Remove Email Autofill 1

2. Right-click the email address. Select “Remove from Previous Recipients List” in the menu.

How to Remove Email Autofill 2