EFS is a free POP3 gateway for any SMTP server such as Microsoft Exchange, Lotus Notes or SLMail. It pulls mail from a Pop3 mailbox at your ISP and distributes the messages to users mailboxes on a local SMTP mail server. EFS requires you to have a registered Internet domain name (to accept and forward mail for) EFS also makes an excellent replacement for the somewhat limited Microsoft SBS Pop3 Connector. The free Standard version does NOT have a user or time limitation and will work under most circumstances. You only need to register the advanced or advanced plus versions if you require additional features available.