$message  = sprintf(__('Username: %s'), $user_login) . "\r\n";
    $message .= sprintf(__('Password: %s'), $plaintext_pass) . "\r\n";
    $message .= wp_login_url() . "\r\n";

    wp_mail($user_email, sprintf(__('[%s] Your username and password'), get_option('blogname')), $message);