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Mail Exchangers
are the name given to the applications that support the SMTP protocol. Mail
Exchangers such as sendmail or Microsoft Exchange should listen for IP
datagrams that arrive on the network interface with a TCP port number of 25 and
on . This port is one of the 'well known ports' defined in RFC 1700. When a
message is received, the mail exchanger should check to see if it is for one of
it's users, then move the mail to the user's mailbox.
To identify the
mail exchangers for a domain name, DNS zone files for the domain contain an MX
resource record identifying the host name and IP address of the mail
exchangers.
Simple mail
transfer protocol differs from Post Office Protocol version 3 (POP3). POP3 is used
by e-mail client applications such as Microsoft Outlook, Mozilla Thunderbird,
Eudora and other e-mail applications to retreive mail stored in personal
mailboxes at the mail server.
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