Enterprise Mail Server
This is a high-performance SMTP POP3 server program designed for large enterprises and Internet Service Providers. It has a lot of security features and options that allow you to protect the server from DDoS attacks as well as safely block SPAM and spammer. As a personal solution, it is ideal for laptop PC users who travel a lot and have to use different ISP on the run. Using the program, you will never encounter a sending problem.