This action runs when a user updates his/her email from the profile page at the front end.
do_action('pg_update_setting_during_email_change',$uid,$user_email);
Simple example
function profile_magic_action_on_email_change($uid,$user_email) { //do something with the user id or email when a user account updates email on the profile page. } add_action('pg_update_setting_during_email_change', 'profile_magic_action_on_email_change');