store user entered mail id to separate table

Question

Have a requirement to develop drupal 9 custom module to get the mail id from the user registration form and store it separate table. I tried the hook_user_presave function to get the mail id but was not able to get it. Hereby sharing the code

function save_mail_user_presave(UserInterface $user)
 {

     try{
                $conn = Database::getConnection();
                $fields["mail"] = $user->get('mail')->value;
            $conn->insert('save_email')
                           ->fields($fields)->execute();
                  \Drupal::messenger()->addMessage($this->t(' Thank you !! Your>

        } catch(Exception $ex){
                \Drupal::logger('save_email')->error($ex->getMessage());
        }

}

Anybody helps me figure out the problem

Answer 1

Drupal 9 already stores the email address upon registration in the init column of the users_field_data table. This is the "email address from the user registration form"; it is different from the user's account email address, which is stored in the mail column of the same table.

So, there's no need for a custom module for this; you can use the column that Drupal already provides.