It supports SMTP, POP3, and Finger protocols, and allows you to send email if you have your own domain, or if your mail server has some kind of restriction (ex. setting the sender as you so choose...).
To use it, just run the application and configure a mail client (Outlook, Eudora...) so that it will connect to 127.1.1.1 (to your own computer as the server).
ArgoSoft will take charge of receiving your mail and sending it off without asking 'questions', or at most just the SMTP authentication. The program barely uses any space and you can leave it minimized on your system tool bar.