See Previous Recipients of Email in Mail for Mac OS X
The Mac Mail app keeps track of all previous recipients that have received an email message sent from an email address that is associated with the app. That means every email recipient will be shown and can be reviewed in the Mail app, including the recipients name when available, their email address, and even the last time the email address was used – even if they are not part of your regular address book Contacts list.
This can be incredibly useful for many situations, including making it easy to recall a forgotten address or misplaced contact information with someone whom the Mac user has communicated with before. Here is how you can access this email recipient list, which is searchable for added convenience.
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