ArGoSoft Mail Server is fully functional SMTP/POP3/Finger server which will let you turn your computer into an email system. It's very compact, takes about 1-5 Mb of disk space, does not have any specific memory requirements, and what is the most important - it's very easy to use.
This free version Can be loaded with Windows startup, Supports unlimited number of accounts, Supports SMTP authentication, and has a built-in web interface.
