Is there a way to clear the cache or old names that you have emailed? Mail seems to store every address even if they aren't in your contact list.
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That is an auto complete feature that takes the information it finds in your address book. You cannot change this without modifying individual entries in the address book.
This is my point, they are not in my address book. they never were.
These are addresses that are being stored from web pages that have a email contact page. i/e fido customer service.