One of the features in the new forum software is Subscriptions. With subscriptions you can be automatically be notified via e-mail when a new message is posted in a forum or when a post is replied to. While this is a great feature to help keep on top of the forums, it can also result in a lot of e-mail's in your inbox. To manage your subscriptions you can go to Settings -> Email Notification Subscriptions and subscribe or unsubscribe.
Also note that if you are using a spam filter you might not receive your notifications. All e-mail's will have hairtalk@hairboutique.com as the sender's address. You may want to add this e-mail address to your whitelist.