Руководство Пользователя для Cisco Cisco Email Security Appliance C160

9-24

Cisco IronPort AsyncOS 7.6 for Email Configuration Guide

OL-25136-01

Chapter 9 Anti-Spam

Table 9-2

shows example email headers for a message as it moves through several hops on its way to the

Cisco IronPort appliance as in

Figure 9-13

. This example shows extraneous headers (ignored by your

Cisco IronPort appliance) which are present once the message has arrived in the recipient’s inbox. The
number of hops to specify would be two.

Table 9-3

shows the headers for the same email message,

without the extraneous headers

Notes for

Table 9-2

Step 1

The Cisco IronPort appliance ignores these headers.

Step 2

The Cisco IronPort appliance receives the message (not counted as a hop).

Step 3

First hop (and incoming relay).

Step 4

Second hop. This is the sending MTA. The IP address is 7.8.9.1.

Step 5

The Cisco IronPort appliance ignores these Microsoft Exchange headers.

Table 9-2

A Series of Received: Headers (Path A Example 1)

Microsoft Mail Internet Headers Version 2.0

Received: from smemail.rand.org ([10.2.2.7]) by smmail5.customerdoamin.org with

Microsoft SMTPSVC(5.0.2195.6713);

Received: from ironport.customerdomain.org ([10.2.3.6]) by

smemail.customerdoamin.org with Microsoft SMTPSVC(5.0.2195.6713);

Received: from mta.customerdomain.org ([10.2.3.5]) by ironport.customerdomain.org

with ESMTP; 21 Sep 2005 13:46:07 -0700

Received: from mx.customerdomain.org (mx.customerdomain.org) [10.2.3.4]) by

mta.customerdomain.org (8.12.11/8.12.11) with ESMTP id j8LKkWu1008155 for

<joefoo@customerdomain.org>

Received: from sending-machine.spamham.com (sending-machine.spamham.com [

7.8.9.1

])

by mx.customerdomain.org (Postfix) with ESMTP id 4F3DA15AC22 for

<joefoo@customerdomain.org>

Received: from linux1.thespammer.com (HELO linux1.thespammer.com) ([10.1.1.89])

by sending-machine.spamham.com with ESMTP;

Received: from exchange1.thespammer.com ([10.1.1.111]) by linux1.thespammer.com

with Microsoft SMTPSVC(6.0.3790.1830);

Subject: Would like a bigger paycheck?

Date: Wed, 21 Sep 2005 13:46:07 -0700

From: "A. Sender" <asend@otherdomain.com>

To: <joefoo@customerdomain.org>

Table 9-3

A Series of Received: Headers (Path A Example 2)

Received: from mta.customerdomain.org ([10.2.3.5]) by ironport.customerdomain.org

with ESMTP; 21 Sep 2005 13:46:07 -0700