Autofill is handy with Mail, but what if Mail keeps putting your buddy's old email address that he doesn't use anymore? Instead of scrolling down to the right one, it may be time for some simple housekeeping. To clean out old addresses from Mail's autofill do this: Click Window>Previous Recipients. Then look through the list and delete what you don't need. If you delete an address that is in your Address Book, no worries, it just removes it from Mail's Previous Recipient list, not Address Book. Whew!
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