Mail.app: Clear Address Auto-Fill Cache How do I clear the auto-fill address field cache in Mac Mail?  I have loads of old addresses that I do not send email to.

A removal and reinstallation of the email accounts does not affect the cache.
See the menu Window -&gt; Previous Recipients - you can select all and delete or be more selective.

Once that's done you may also want to prune your address book or disable mail from auto-filling from there as desired.