Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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Cisco IronPort AsyncOS 7.6 for Email Configuration Guide
OL-25136-01
Chapter 5      Configuring the Gateway to Receive Email
 shows the suggested settings for implementing sender verification:
Implementing Host Sender Verification for the SUSPECTLIST Sender Group
Step 1
Select Mail Policies > HAT Overview.
Step 2
Click SUSPECTLIST in the list of sender groups.
Figure 5-28
HAT Overview Page
Step 3
The Sender Group: SUSPECTLIST page is displayed:
Table 5-15
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.