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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 provide
- the user interface for composing and reading electronic mail messages,
- the <EM>sendmail</EM> program implements the transfer and routing of
- those messages, and POP3 (Post Office Protocol, version 3) allows PC and
- Macintosh users to read messages delivered to a remote server.
- <P>
- The <EM>sendmail</EM> program receives mail messages from user mail agents
- in the local network and from remote mail servers. When a mail message arrives,
- sendmail requests a mail exchanger record (MX record) 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 mail agent, or it is read remotely on a PC or Macintosh host with a
- user mail agent that relies on POP3 service.
- <P>
- The <I>WebForce Internet Gateway</I> mail configuration tool provides
- configuration and management tools for both <EM>sendmail</EM> and POP3
- through these forms:
- <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
- <EM>sendmail</EM>. Additional information is available from the
- sendmail(1M), configmail(1M), and popper(8) references pages.
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