IBM AH0QXML User Guide - Page 51

Chapter 4. Domino 6 Server anti-spam features

39

Be aware that entries found in both the Allow and Deny fields will result in the

user

’

s messages being Denied. The Deny field take precedence over the Allow

field.

The use of Group names in the allow and deny fields is acceptable; however, the

group name must be the actual group name and not that of the groupnames

internet address. Use the actual group name as it appears in the Group view in

the Domino Directory.

4.2.3

Disable routing mail to groups

New in Domino 6 is the ability to stop routing mail to groups. By enabling a

Notes.ini variable,

RouterDisableMailToGroups=1

, the Router will no longer route

any mail addressed to a group name. If the variable is not set, the router would

normally allow mail addressed to a group name to be delivered to all the

members of the group. This ini variable will mostly affect messages send to

groups via SMTP, although all mail addressed to groups will be blocked

regardless of the origin of the message.

Mail sent to groups by Notes users will be sent, because Notes client does a

group expansion before sending the message off. By the time the router gets the

message, it looks like it is sent to multiple, individual recipients, not groups.

However, if internal users send mail to a group with a syntax

([email protected] or [email protected]) that isn

’

t

expanded by the client, these messages will be rejected. Any other clients, even

authenticated, can

’

t send mail to groups. This includes iNotes Web Access

users.

Tip:

Domino 6 has a notes.ini variable that can be used to limit the number of

recipients that can be included in a single message. If the number of recipients

in an incoming STMP message exceeds the number of recipients you

specified for the variable

SMTPMaxForRecipients=

, the message will be

rejected.

Use of this variable will limit the effectiveness of directory harvesting and will

also eliminate spam messages which are sent to large numbers of users

within your organization.

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 51

Disable routing mail to groups, the Domino Directory.

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