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11.12.2 Mail policy management<br />

New for<br />

Domino 6<br />

New for<br />

Domino 6<br />

522 Lotus Security Handbook<br />

Through the Configuration Settings document, Domino administrators can set<br />

limits on who sends what to whom, as well as establish mail rules on the Domino<br />

server to manage the messages entering your domain.<br />

Inbound Intended Recipient Controls<br />

Inbound Intended Recipients Controls have been enhanced in ND6. You now<br />

have the ability to only accept messages addressed to users in your domain.<br />

This reduces the number of dead messages in your mail.box.<br />

In the “Verify that local domain recipients exist in the Domino Directory” field,<br />

select “Enabled” for Domino to verify the name of the connecting host by<br />

performing a reverse DNS lookup. Domino checks DNS for a PTR record that<br />

matches the IP address of the connection host to a hostname. If Domino cannot<br />

determine the name of the remote host because DNS is not able or no PTR<br />

record exists, it does not allow the host to transfer mail. Although Domino<br />

accepts the initial connection, later in the SMTP transaction it returns an error to<br />

the connection host in response to the Mail From command.<br />

You cannot use wildcards in the field “All messages intended only for the<br />

following.”<br />

For more information, see REDP-3622.<br />

Mail rules<br />

You can create content filtering rules for a server that define actions to take on<br />

certain messages. When a new message that meets a specified condition is<br />

deposited in MAIL.BOX, Domino automatically performs the designated action.<br />

Rule conditions are based on content in the message headers or in the message<br />

body.<br />

You can use mail rules to prevent spam by:<br />

► Refusing to accept or deliver messages that contain offensive content<br />

► Holding messages with key phrases in mail.box<br />

► Moving messages to a quarantine or “graveyard” database<br />

► Changing message routing state<br />

► Journaling messages<br />

For example, you could create a rule that rejects mail with subjects like “make<br />

money fast” or that comes from a known spam vendor. Similarly, you can restrict<br />

users from receiving message attachments that do not have a business purpose<br />

by setting up a rule to intercept messages that contain attachments of certain file

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