Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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Cisco AsyncOS 8.0.2 for Email User Guide

Chapter 7 Defining Which Hosts Are Allowed to Connect Using the Host Access Table (HAT)

Verifying Senders

Table 7-8

shows the suggested settings for implementing sender verification:

Throttling Messages from Unverified Senders Using the SUSPECTLIST Sender Group

Procedure

Step 1

Select Mail Policies > HAT Overview.

Step 2

Click SUSPECTLIST in the list of sender groups.

Figure 7-5

HAT Overview Page

Step 3

Click Edit Settings.

Table 7-8

Sender Verification: Suggested Settings

Sender Group

Policy

Include

UNVERIFIED

SUSPECTLIST

THROTTLEMORE

THROTTLED

Prior to SMTP conversation:

Connecting host PTR record does not exist in the DNS.

Connecting host reverse DNS lookup (PTR) does not match
the forward DNS lookup (A).

ACCEPTED

Envelope Sender Verification during SMTP conversation:

- Malformed MAIL FROM:

- Envelope sender does not exist in DNS.

- Envelope sender DNS does not resolve.