The best thing about Carrierzone is the ability to monitor all incoming and outgoing emails. The interface is very easy to use and the customer service is very helpful and professional. The only thing I dislike is the fact that Carrierzone is a little expensive. I would recommend this product to anyone who wants to monitor all incoming and outgoing emails. I have been using Carrierzone for a couple of years now and I have been very happy with the product. I have been able to monitor all incoming and outgoing emails and I have been able to block spam emails.