IBM AH0QXML User Guide - Page 21

Chapter 2. Preventing unwanted e-mail and spam

9

they store it for use in bulk mailing. The best defense against spammer

news-bots is to simply provide human-recognizable alterations to the address

that make it more difficult for the news-bot to recognize any e-mail address

pattern.

Listserv harvesting

Spammers develop programs that subscribe to list servers as any other user can,

but they never send to the subscribed list. Instead they capture other list

subscriber's e-mail addresses over time. The best defense against Listserv

harvesting is to simply provide human-recognizable alterations to the sending

and reply address to make them more difficult for an automated list-bot to

recognize any e-mail address pattern.

2.1.2

Avoiding harvesting

Advise your users to avoid having their e-mail addresses harvested by employing

the following techniques:

±

Have a personal or

“

junk

”

account from a free provider that is used specifically

for newsgroup or commercial Web site interaction.

±

Do not post their address on newsgroups or public Web discussions.

±

Avoid publishing their e-mail address in public

“

people finder

”

directories or

Instant Messaging directories.

±

Avoid using standard e-mail addresses for domain name registration

contacts; instead, create accounts specifically to manage registration contact.

±

Have users avoid using

“

e-invite

”

or

“

postcard

”

services with their

organizational e-mail address: these services often sell or solicit to the e-mail

addresses that they gather.

±

Make sure that users know to read the privacy statements on Web sites that

they provide information to.

Your public Internet site is also a target for address harvesting; here are some

tips to make your Web site difficult for spammers to target:

±

Do not create public directories available on the Internet without some form of

protection from harvesters. Consider making this area a

“

sign in

”

area

requiring some form of authorization, or confusing harvesters (as described in

the next section).

±

Be selective about which addresses are provided as contact points for the

organization and try not to make them easy picking for spammers.

±

Have public feedback mail delivered to a

“

mail in

”

mailbox so that spam

doesn't clutter up a user's mailbox.

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 21

Avoiding harvesting, Listserv harvesting

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