Mini Relay Server is a Free portable SMTP Server. Once running, Mini Relay becomes your personal SMTP server at localhost, enabling you to bypass your ISP's mail server and send your emails to the recipient's mail server directly. Mini Relay is a great tool to have with you if you are always on the move and find yourself constantly hoping on different networks. Simply configure your email client to use IP 127.0.0.1 as the SMTP server and MiniRelay will take care of the rest.
Mini Relay Portable SMTP Server Screenshot
Authors Website: http://netvicious.com
Download: You can download Mini Relay HERE