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3.2.1 SMTP Listener/Server
Incoming SMTP messages are processed by the SMTP Listener task. This task
is responsible for accepting incoming requests to communicate with the Domino
SMTP server. The SMTP Listener task and the configuration settings that it uses
are your first line of defense against spam. The features employed by the SMTP
Listener task include:
DNS blacklist filtering
Inbound relay control and enforcement
Inbound intended recipient controls
Disabled SMTP routing to groups
Inbound connection controls
Inbound sender controls
For detailed discussion about the use of each of the listed feature, refer to
Chapter 4, "Domino 6 Server anti-spam features" on page 29.
The SMTP Listener uses the configuration settings to determine if an incoming
connection should be accepted. Once a connection is established, the SMTP
Listener checks additional information in any incoming message and determines
if the incoming message should be accepted. DNS blacklist filtering allows you to
use an alternative vendor to validate the sending IP address against their
database. If an originating IP address is determined to be a source of spam, the
connection can be denied, or the incoming message can be tagged or logged.
Even without blacklist processing, the incoming connection can be denied based
on the originating IP address or name. Incoming messages can be processed
and/or rejected based on origin e-mail address, IP address, or domain name.
Figure 3-3 and the list following the figure describe the sequence of configuration
checking that occurs during the receipt of a message.
Chapter 3. Domino 6 anti-spam architecture
21
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