IBM AH0QXML - Lotus Domino Messaging, User Manual

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Lotus Domino 6 spam Survival Guide for IBM eServer
Most of the server rules in the table contain simple evaluations and simple
actions. When creating rules, keep the evaluation conditions simple. Rules will be
executed on messages that meet the criteria specified including Notes messages
sent to another Notes user, not just SMTP messages.
Be aware of the performance implications that could be imposed on your server
when using rules. Rules should be monitored frequently when first implemented.
You may need to refine the conditions or change the action performed on
messages. Using the “Move to Database” action, you can further examine the
contents of the messages acted upon and refine rules, as needed.
4.4 Controlling use of your server as a relay
Spammers try to distribute their spam messages to as large an audience as
possible, and they try to cover their tracks by any means. One of their methods is
relaying mail through third party servers to disguise the origin of the messages.
The third party server hardly ever has anything to do with the message content.
Your server may end up on a DNS Blacklist through no direct fault of your system.
This can happen if you have a relay open (you allow anyone relaying mail off your
server) and a spammer has used your server for relaying spam messages.
You need to close your relay and control who can relay mail off your server. This
section describes how you can to do it.
4.4.1 Inbound relay controls
Inbound relay controls provide settings to control which servers can use your
server as a relay, and the destinations you’ll allow mail hosts to relay messages
to.
The inbound relay controls settings are where relay restrictions for your Domino
SMTP Server are set. When you initially set up your Domino R5 Server, no relay
restrictions are applied. All hosts are allowed to relay off this server and all
destinations will be allowed to be relayed to. Notice that this has been changed in
Domino 6: when you set up you Domino 6 Server, relaying is denied by default.
Using Allow and Deny destination lists, these controls determine the relay
destinations to which a server can or cannot send mail and the sources from
which the server can and cannot accept relays.
The wording of the field names tends to cause confusion in what setting is for
what functionality. There are four fields on the server configuration document
dealing specifically with the inbound relay controls.