SLmail is an Internet mail server. It is a post office for Internet mail clients. It is not a mail reader, for example, a client such as Eudora or Microsoft Outlook. It is a central clearinghouse that those clients come to for their mail.
SLmail provides SMTP and POP3 support for sending and receiving mail. Simple Mail Transport Protocol (SMTP) is an Internet Protocol (IP) originally implemented on UNIX. SMTP is the means by which mail is exchanged on the Internet. Post Office Protocol 3 (POP3) is a later addition that allows mail servers to hold mail for clients, allowing Internet mail to become a client/server affair. Mail clients use SMTP to send outgoing mail to SLmail. Mail clients use POP3 to ask SLmail for incoming mail.
SLmail can be used as an in-house mail server with no connection to the Internet. In this configuration, it serves to hold and pass mail for local users. The real power of SLmail, however, is to connect to an Internet Service Provider (ISP) and pass mail to and from the larger world. SLmail will work with either a dedicated Internet connection, which is always present, or a dial-up Internet connection, such as a SL/IP or PPP connection that comes and goes.
SLmail allows an unlimited number of users, mailboxes and mailing lists. It will support up to 1,023 secondary domains.
SLmail is downloadable from Seattle Lab's website at www.seattlelab.com. SLmail is also distributed on CD-ROM and from other Internet sites around the world. No matter how you received your copy of SLmail, it is worthwhile to check Seattle Lab's website to determine whether you have the most recent version.