One click 'add sender to address book'
So simple - add a one click means to add a sender's email address to address book. After all Yahoo/Oath/whoever is behind all this seem very adept at grabbing people's personal information for their own commercial purposes, why not for the sake of user functionality when wanting to grab a sender's address to add to one's address book?
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J O commented
another reason to totally hate this new contact list - totally agree - classic mail was much better than this new mail and also better than the basic mail, especially for the contacts, I either have one contact missing or four of the same person in my contact list