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4. Click the tabs in the following order: Router/SMTP
Controls
SMTP Inbound Controls and navigate down to Inbound Intended
Recipient Controls.
5. Double-click the document or click the Edit Server Configuration button to put
the document in edit mode.
Figure 4-2 Inbound Intended Recipients controls
6. Make the desired changes to the Inbound Intended Recipients Controls fields
and click Save & Close. The fields have the following meanings:
– "Verify that local domain recipients exist in the Domino Directory."
The default is disabled.
When enabled: If the domain part of an address specified in an SMTP
RCPT TO command matches one of the configured local Internet
domains, the SMTP listener checks all configured directories to determine
whether the specified recipient is a valid user. If all lookups complete
successfully and no matching username is found, the SMTP server
returns a 550 permanent failure response indicating that the user is
unknown. Enabling this option has benefits in the areas of bandwidth,
storage, and performance, as the body of the rejected message is never
delivered.
Enabling this option can help prevent messages sent to nonexistent users
(for example, spam messages and messages intended for users who have
left the organization) from accumulating in MAIL.BOX as dead mail.
Attention: If you choose to enable this option, you need to be aware that a
spammer could obtain valid e-mail addresses for users on your Domino
Server. This is due in part to the verification that takes place during the initial
SMTP conversation. Attempting to guess valid e-mail addresses (of common
names), a spammer has the potential to harvest addresses of your users.
Chapter 4. Domino 6 Server anti-spam features
Restrictions and
37
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