Drupal 7 - Send an E-mail to user on content modification

I have a webform page where user submits its query. On form submission a confirmation mail is sent to the user and admin. I have installed the Custom Webform Comment module through which user and admin both can comment and change the status in the form, now I want to send mail on each comment and status change to both admin and user.

I have tried using Webform Rules module but it is not working. The module is not sending mail

Is there any other way or module(s) through which I can send mail to the user?

Webform version 7.x-4.15

Thanks in advance :)

I resolved the above issue by inserting hook_mail code in my Custom Webform Comment module.

In case anyone else is facing the same issue here is the code which I inserted in the custom_webform_comments.module file.

/**
 * Implements hook_mail().
 */
function custom_webform_comments_mail($key, &$message, $params) {
  switch($key) {
    case 'custom_webform_comments_email':
      $message['subject'] = t('Submit Request Form update');
      $message['body'][] = t('You have got a new comment and status update on your submitted form.',array('@site-name' => variable_get('site_name','example.com')));
       $message['body'][] = t(variable_get('custom_webform_comments_email_text',''));
      break;
  }
}

After the above line of code put the following code after the database insert query inside the function custom_webform_comments_commentform_submit() to send mail after every comment update.

function custom_webform_comments_commentform_submit($form, $form_state) {
  $fv = $form_state['values'];
  $insert1 = db_insert('custom_webform_comments')
    ->fields(array(
      'cid' => NULL,
      'comment' => $fv['addnew']['comment'],
      'subject' => $fv['addnew']['subject'],
      'nid' => $fv['addnew']['nid'],
      'sid' => $fv['addnew']['sid'],
      'commenter_user_id' => $fv['addnew']['commenter_user_id'],
      'comment_parent' =>  '0',
      'ts' => date("Y-m-d H:i:s")
      ))->execute();
    if($insert1)
    {
        global $user; 
        $params = array(
           'body' => $message,
           'subject' => 'Website Information Request',
           'headers'=>'simple',
        );
        $message = drupal_mail('custom_webform_comments', 'custom_webform_comments_email', $user->mail, language_default(), $params, 'test@example.com', TRUE);
        if (!empty($message['result'])) {
            watchdog('mail', 'Mail sent Successfully (from %from to %to) for comment update', array('%from' => $message['from'], '%to' => $message['to']), WATCHDOG_NOTICE);
            //drupal_set_message("Mail sent!");
        }
        else{
            watchdog('mail', 'Error sending e-mail (from %from to %to).', array('%from' => $message['from'], '%to' => $message['to']), WATCHDOG_ERROR);
            drupal_set_message(t('Unable to send e-mail. Contact the site administrator if the problem persists.'), 'error');
        }
    }
    return $insert1; 
}

Similarly to get mail on every status update, update the following function.

function custom_webform_comments_status_dbupdater($data) {
  global $user;
  //Insert values into database
  $insert = db_insert('custom_webform_submission_status')
    ->fields(array(
      'id' => NULL,
      'status' => $data['status'],
      'submit_time' => date("Y-m-d H:i:s"),
      'nid' => $data['nid'],
      'sid' => $data['sid'],
      'user' => serialize($user)
    ))->execute();
    if($insert)
    {
        global $user; 
        $params = array(
           'body' => $message,
           'subject' => 'Website Information Request',
           'headers'=>'simple',
        );
        $message = drupal_mail('custom_webform_comments', 'custom_webform_comments_email', $user->mail, language_default(), $params, 'test@example.com', TRUE);
        if (!empty($message['result'])) {
            watchdog('mail', 'Mail sent Successfully (from %from to %to) for status update', array('%from' => $message['from'], '%to' => $message['to']), WATCHDOG_NOTICE);
            //drupal_set_message("Mail sent!");
        }
        else{
            watchdog('mail', 'Error sending e-mail (from %from to %to).', array('%from' => $message['from'], '%to' => $message['to']), WATCHDOG_ERROR);
            drupal_set_message(t('Unable to send e-mail. Contact the site administrator if the problem persists.'), 'error');
        }
    }
  return $insert;
}