Cisco Cisco Email Security Appliance X1050 Guía Del Usuario
7-30
Cisco AsyncOS 8.0.1 for Email User Guide
Chapter 7 Defining Which Hosts Are Allowed to Connect Using the Host Access Table (HAT)
Verifying Senders
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 7-9
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).
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.