IBM AH0QXML User Guide - Page 39

Chapter 3. Domino 6 anti-spam architecture

27

±

DNS blacklist filters: Check inbound connection and look-up host in DNS

blacklist; log and reject message if determined to be from a known spamming

site.

A specific host is sending a large amount of spam to your server.

±

Inbound connection controls: Deny connection from this host.

A specific e-mail address is sending a large amount of spam to your server.

±

Inbound sender controls: Deny messages from this address.

External servers (spammers) are using your server as a relay.

±

Inbound relay controls: Close down your open relay,

“

Deny messages to be

sent to the following external domains: *

”

and

“

Deny messages from the

following internal hosts to be sent to external internet domains: *

”

(Note: *

means all).

±

Inbound relay enforcement: Change

“

Perform Anti-Relay enforcement for

these connecting hosts,

”

to External hosts or All connecting hosts.

±

DNS blacklist filters: Check inbound connection and look-up host in DNS

blacklist; log and reject message if determined to be from a known spamming

site.

Messages are sent to users that are no longer with your company.

±

Inbound intended recipient controls: Enable

“

Verify that local domain

recipients exist in the Domino Directory

”

to deny messages for recipients not

listed in the Domino Directory, or list the e-mail address in the

“

Deny

messages

”

field.

Messages are being received containing offensive content.

±

Server mail rules: Create a rule to reject messages based on text of message,

body or subject.

±

User mail rules: Create a rule to reject messages based on text of message,

body or subject.

Internal SMTP servers/users are using your Domino 6 server as a relay.

±

Inbound relay controls: Close down your open relay,

“

Deny messages to be

sent to the following external domains: *

”

and

“

Deny messages from the

following internal hosts to be sent to external internet domains: *

”

(* means

all).

±

Inbound relay enforcement: Change

“

Perform Anti-Relay enforcement for

these connecting hosts

”

to

“

All connecting hosts.

”

Section	Page
Front cover	1
Contents	5
Notices	7
Trademarks	8
Preface	9
The team that wrote this redbook	9
Become a published author	11
Comments welcome	12
Chapter 1. Introduction	13
1.1 Definition of spam	14
1.2 Categorizing spam	14
Chapter 2. Preventing unwanted e-mail and spam	19
2.1 Spam avoidance techniques	20
2.1.1 Passive harvesting attacks	20
2.1.2 Avoiding harvesting	21
2.1.3 Confusing the harvesters	22
2.1.4 Inform Users	22
2.2 How to block spam	24
2.2.1 At the gateway	25
2.2.2 At the server	25
2.2.3 By the end user	26
2.2.4 Selecting the best approach	26
2.2.5 Managing the ongoing anti-spam campaign	27
2.2.6 Summary	28
Chapter 3. Domino 6 anti-spam architecture	29
3.1 The Domino messaging environment	30
3.2 Domino 6 messaging components	32
3.2.1 SMTP Listener/Server	33
3.2.2 Router	35
3.3 Domino 6 anti-spam configuration	35
3.3.1 Server configuration features	36
3.3.2 User configuration features	37
3.4 Common problems and solutions	37
Chapter 4. Domino 6 Server anti-spam features	41
4.1 How to detect spam	42
4.1.1 Examining the message properties	42
4.1.2 Separating legitimate e-mail from spam based on content	43
4.2 Controlling connections from spammers	44
4.2.1 DNS Blacklist filters	44
4.2.2 Inbound Intended Recipients Controls	48
4.2.3 Disable routing mail to groups	51
4.2.4 Inbound connection controls	53
4.2.5 Inbound sender controls	54
4.3 Controlling delivery of spam	57
4.3.1 Server mail rules	57
4.4 Controlling use of your server as a relay	66
4.4.1 Inbound relay controls	66
4.4.2 Inbound relay enforcement	71
4.5 Protecting your Domino server from active address harvesting attacks	74
4.5.1 SMTP harvesting attacks	74
4.5.2 Spam mail bombing	74
4.5.3 Direct SMTP RCPT TO harvesting	74
4.5.4 Defending against active attacks	75
Chapter 5. Using mail file rules to prevent spam	77
5.1 Distinguishing between spam and legitimate e-mail	78
5.2 Mail file rules	80
5.2.1 Setting up mail file rules	80
5.2.2 Developing anti-spam mail file rules	83
5.2.3 Viewing mail rules and the evaluation sequence	89
5.2.4 Monitoring mail file rules	90
Chapter 6. Third party anti-spam products	93
6.1 Anti-spam products for Notes and Domino	94
6.1.1 spamJam for Lotus Notes and Domino	94
6.1.2 SpamEraser for Lotus Notes and Domino 6	97
6.1.3 iQ.Suite	100
6.1.4 ScanMail for Lotus Notes with eManager	101
6.1.5 XM SpamStop	104
6.1.6 Other anti-spam products for Notes and Domino	106
6.2 Anti-spam server and gateway products and services	106
6.2.1 BrightMail Anti-Spam 4.0 from BrightMail, Inc.	106
6.2.2 ActiveState PureMessage	107
6.2.3 Trend Micro Inc. products	109
6.2.4 Other anti-spam server or gateway products and services	110
Related publications	111
IBM Redbooks	111
Referenced Web sites	111
How to get IBM Redbooks	112
IBM Redbooks collections	112
Index	113

IBM AH0QXML User Guide - Page 39

Inbound intended recipient controls: Enable, Verify that local domain

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