Today's enterprise environments need fast, reliable and immediate execution of email messaging flow. And to successfully achieve greater deliverability, proven technologies need to be in place to optimize the messaging infrastructure. With a commercial grade MTA configured properly, you will notice higher efficiency and fewer points of failure ranging from message assembly to successful inbox delivery. Now, as ISPs begin to enforce more stringent delivery policies, messages that are sent through a shared gateway are more likely to be compromised or blocked. As ISPs filter on a particular IP, there is an increased chance that all customers sending from that same IP will be blocked.