Replying to comments is an extremely good practice for bringing recurring traffic to your Drupal website as you are interacting with your visitors. If you can send those new comments to an email address, you can respond to them quicker since a late reply usually goes unnoticed. Normally in a Drupal 6 website, the admin user has to login to the website and moderate the comments which often leads to a significant delay in response time. Check out our instructions on how to send comments to an email address in a Drupal 6 website.