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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 utilties: <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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