Need help finding the list of emails not included in my contacts

When I start a new email, as I type the email address, there are suggested emails based on emails I have sent before - for people that are not in my contact list. Is there way to add all of these to my contacts? or get a list in some other format?

the suggested emails can be found in the Tools>Settings>Mail>Compose under Recipients History. I’m afraid you can only clear or remove messages from it though.