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What is a smart host? Where would you configure it?
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Answer Posted / muthiah nagarajan
A smart host is a type of mail relay server which allows an
SMTP server to route e-mail to an intermediate mail server
rather than directly to the recipient’s server.
Often this smart host requires authentication from the
sender to verify that the sender has privileges to have
mail forwarded through the smart host.
This is an important distinction from an open relay that
will forward mail from the sender without authentication.
Common authentication techniques include SMTP-AUTH and POP
before SMTP.
1.Use for backup mail (secondary MX) services
When configured to be a backup mail server (not the primary
MX record) a smart host configuration will accept mail on
behalf of the primary mail server if it were to go offline.
When the primary mail server comes back online, mail is
subsequently delivered via the smart host.
2.Use in spam control efforts
Some ISPs, in an effort to reduce e-mail spam originating
at their customer’s IP addresses, will not allow their
customers to communicate directly with the recipient’s mail
server via the default SMTP port number 25. In this case
the customer has no choice but to use the smart host
provided by the ISP.
A growing number of systems also verify the sending system
against known lists of cable modem and DSL networks and
will not accept SMTP connections from these systems to
reduce the amount of incoming spam. Field tests have shown
this can have a sizable impact on the number of spam
messages one receives and it is expected to become more and
more common
3.Use in centralizing email services
When a host runs its own local mail server, a smart host is
often used to transmit all mail to other systems through a
central mail server. This is used to ease the management of
a single mail server with aliases, security, and Internet
access rather than maintaining numerous local mail servers.
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