What you are referring to is the AutoComplete List, which is completely independent of your contacts.
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If you want to purge your entire AutoComplete List (and it will be slowly rebuilt again as you receive and send email):
1. Alt + F, T (File Backstage View, Options).
2. Navigate to the Mail Options pane.
3. Tab into that pane and locate the Empty AutoComplete list button and activate it. (Or after you're in the pane hit E several times until you land on that button, then activate it,
4. You will get a confirmation dialog asking, "Are you sure you want to empty the AutoComplete List?," for which there is a Yes and No button.? Choose appropriately.
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If you want to delete individual entries, the easiest way to do that is to type in a character or two in the To:, CC:, or BCC: edit box then any address that is a match for what you've typed in will appear in a list that you can down-arrow through immediately beneath the edit box.? If you are on any entry in that list, and hit your Delete key, it will be removed from the AutoComplete List (at least until you do something that would cause it to be added back again - and if you don't send anything to that address moving forward, nor receive anything from it, it stays gone).
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Brian? ¡¤¡á?¡¤???? ¡¤?Virginia, USA?- Windows 11 Pro, Version 24H2, Build 26100; M365 Family; Android 13 (Xiaomi HyperOS 1.0.10.0)
It is much easier to be critical than to be correct.
