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- <H1>Electronic Mail</H1>
- <P>
- Internet mail service is implemented by a combination of programs and
- protocols that perform three basic functions: user mail agents that
- provide the user interface for composing and reading electronic mail,
- remote mail service, and message transfer and routing. The <I>WebForce
- Internet Gateway</I> mail service comprises two utilities: <EM>sendmail</EM>,
- which implements mail tranfer and routing, and POP3 (Post Office Protocol,
- version 3), a mail server for PC and Macintosh users.
- <P>
- The <EM>sendmail</EM> program receives mail messages from the user agents
- in the local network and from remote mail servers. When a mail message arrives,
- sendmail requests a mail exchanger record (MX record) from DNS to determine
- where to forward the mail. If sendmail is unable to identify the destination
- host returned in the record, it passes the message to a <EM>relay</EM> host
- for local domain addresses, or to a <EM>forwarder</EM> host for external
- addresses.
- <P>
- Mail that <EM>sendmail</EM> receives is read on the local host with a UNIX
- user agent, or it is read remotely from a PC or Macintosh host with a user
- agent that relies on POP3 service.
- <P>
- Use these forms to configure <I>WebForce Internet Gateway</I> mail services:
- <UL>
- <LI><A HREF="index.mail1.shtml" TARGET="left">POP3 Accounts</A>
- <LI><A HREF="index.mail2.shtml" TARGET="left">POP3 Mail</A>
- <LI><A HREF="index.mail3.shtml" TARGET="left">Sendmail Configuration</A>
- </UL>
- <P>
- See Chapter 8 of IRIX Admin: Networking and Mail for more information on
- sendmail. Also see the sendmail(1M), configmail(1M), and popper(8) references
- pages.
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