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Mail service in Mac OS X Server is comprised of many
dierent components that work together to provide
incoming and outgoing Mail service, mail ltering, and
mailing lists.
This chapter begins with a look at the standard protocols used for sending
and receiving mail. Then it explains how Mail service works, discusses mailing
lists, and concludes with information on how Mail service integrates with other
network services.
Mail Service Architecture
Mail service in Mac OS X Server allows network users to send and receive mail over
your network or across the Internet.
Mail service sends and receives mail using the following standard Internet mail protocols:
Simple Mail Transfer Protocol (SMTP) Â
Internet Message Access Protocol (IMAP) Â
Post Oce Protocol (POP) Â
A standard mail client setup uses SMTP to send outgoing mail and POP and IMAP to
receive incoming mail. Mac OS X Server includes an SMTP service and a combined POP
and IMAP service.
Mail service also uses a Domain Name System (DNS) service to determine the
destination IP address of outgoing mail.
1
Understanding Mail Service