You only need to update the letter to its existing value. This should trigger the sending of another email. I could not verify the code, but it should be the way you do it for different platforms.
PFUser.currentUser().email = PFUser.currentUser().email
PFUser.currentUser().saveInBackground()
ParseUser.getCurrentUser().setEmail(ParseUser.getCurrentUser().getEmail());
ParseUser.getCurrentUser().saveInBackground();
Parse.User.current().set("email", Parse.User.current().get("email"));
Parse.User.current().save();
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