IBM AH0QXML User Guide - Page 84

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Lotus Domino 6 spam Survival Guide for IBM eServer

Table 5-1

Types of mail file rules with effectiveness and performance cost

The anti-spam rule building technique that we show in this section is oriented

toward the isolation and reduction of spam. This technique requires some review

of the contents of various folders in the user

’

s mail file. The folders used in this

example are:

±

Incoming\Suspicious

- This folder is used to hold e-mail that our rules have

determined to be suspicious and likely to be spam.

±

Incoming\My Customers

- This folder is used to hold incoming mail

messages that our rules have determined to be from known customers and

vendors.

As a normal consequence of receiving e-mail, all users make an initial

assessment of their inbound e-mail. However, as users develop anti-spam rules,

they must make a qualitative analysis of the e-mails as they relate to the

established mail rules. A user employing the technique in our example on their

own mail file would have to periodically review all of the Incoming folders. The

user must review the content of the Suspicious folder for false positives, that is,

desired e-mails that were initially determined to be spam. At other times, the user

must assess whether more stringent criteria are required to filter out more spam.

Type of rule

Overall Anti-Spam

Effectiveness

Performance Cost

Very

Medium

Less

High

Medium

Low

Address Blocking

X

X

Domain Blocking

X

X

Self-mail

X

X

Subject Content

X

X

Body Content

X

X

Filing Acceptable Mail

X

X

Note:

In our examples we have used several folders and we are using rules to

direct e-mail and spam e-mail into them. You don

’

t have to use this same

method to handle your mail. For example, you could use just a single folder for

all mail you suspect to be spam without filing anything else automatically. You

could send suspicious e-mail to another mail-in database, set an expiry date

on the messages, or delete all of the suspicious e-mail. Pick the style that suits

you best. Be careful when setting up rules that delete any mail, as deleted

e-mail messages cannot be recovered.

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 84

Incoming\Suspicious, Incoming\My Customers, Type of rule, Overall Anti-Spam, Effectiveness

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