Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Define which hosts are allowed to connect to the listener on the Mail Policies > HAT Overview page. 

 shows the HAT Overview with the sender groups and mail flow policies defined by default 

for a public listener.

When a listener receives a TCP connection, it compares the source IP address against the configured 
sender groups. It evaluates the sender groups in the order listed on the HAT Overview page. When it finds 
a match, it applies the configured mail flow policy to the connection. If you have configured multiple 
conditions within a sender group, that sender group is matched if any of the conditions match. 

When you create a listener, AsyncOS creates predefined sender groups and mail flow polices for the 
listener. You can edit the predefined sender groups and mail flow policies, and create new sender groups 
and mail flow policies. For more information, see 

You can export all information stored in a Host Access Table to a file, and you can import Host Access 
Table information stored in a file into the appliance for a listener, overriding all configured Host Access 
Table information. For more information, see 

.

By default, the HAT is defined to take different actions depending on the listener type:

Public listeners. The HAT is set to accept email from all hosts.

Private listeners. The HAT is set up to relay email from the host(s) you specify, and reject all other 
hosts.

In the HAT Overview, the default entry is named “ALL.” You can edit the default entry by clicking the 
mail flow policy for the ALL sender group on the Mail Policies > HAT Overview page.