IBM AH0QXML User Guide - Page 78

66

Lotus Domino 6 spam Survival Guide for IBM eServer

5.1

Distinguishing between spam and legitimate e-mail

In this section we look into some characteristics of spam mail content. There are

characteristics of spam mail that allow you to scan or search for items that can

help you classify useful e-mail and eliminate spam e-mail. Some common

features of spam are easily discernible by simply viewing the message subject or

content. Others can be deduced by taking note of the source of incoming

messages.

Viewing the page source of e-mail messages

The Notes 6 client allows you to view source information in a mail message by

opening the message in the client and then selecting View

→

Show

→

Page

Source from the Notes 6 client menu. This feature will show the

“

raw

”

content of

the message as received by the SMTP server. The receiving SMTP server has to

be Domino version 6.

Example 5-1 shows the page source information for a sample spam e-mail

message.

Example 5-1

Page source of a sample spam e-mail message

Received: from a3mail.lotus.com ([9.xx.xx.xx])

by cammail01.lotus.com (Lotus Domino Release 6.0)

with ESMTP id 2002110613302032-41715 ;

Wed, 6 Nov 2002 13:30:20 -0500

Received: from internet1.lotus.com ([9.xx.xx.xx])

by a3mail.lotus.com (Lotus Domino Release 6.0)

with ESMTP id 2002110613301828-376177 ;

Wed, 6 Nov 2002 13:30:18 -0500

Received: from lotus2.lotus.com (lotus2.lotus.com [129.42.250.42])

by internet1.lotus.com (8.12.6/8.12.6) with ESMTP id gA6IUGBF027827

(version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=FAIL);

Wed, 6 Nov 2002 13:30:16 -0500 (EST)

Received: from yahoo.ca ([213.86.167.33])

by lotus2.lotus.com (8.12.6/8.12.6) with SMTP id gA6IWe0r019429;

Wed, 6 Nov 2002 13:32:44 -0500 (EST)

To: [email protected]

/*

This is the recipient of the e-mail message

*/

Subject: Awseome way to make money.

Importance: Normal

Message-Id: <[email protected]>

Date: Wed, 06 Nov 2002 13:32:33 -0500

X-MSMail-Priority: Normal

Note:

Page source is available for messages sent from the Internet. You

cannot view the page source of a message that was sent to you from your own

Domino domain.

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 78

Distinguishing between spam and legitimate e-mail, Viewing the source of e-mail messages

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