Is iphone's mail App using predicitve autocomplete based on recent interactions?
We don't really get to craft the algorithms or set anything on autocorrect. Pretty much we can use it or not and we can clear the behavior it has learned based on how you type and start over.


Settings -> General -> Reset Keyboard Dictionary


Mail also can let you clear a bad contact using this nicely written guide from iMore on how to tap to clear a bad assumption. You have to do this one by one as far as I know.


https://www.imore.com/how-remove-recent-contacts-mail-app-iphone