Corporate SMTP Server 

Corporate SMTP Server is a reliable high-performance SMTP server program for corporations and Internet Service Providers. It is simple and absolutely bullet-proof, it has a lot of security features and options you can use to protect the server from the outside of the Internet as well as safely block SPAM and spammers. It can be installed on several computers while the common message queue can be kept on a separate dedicated PC to increase sending power of your organization.