Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Relays mail to the appropriate internal groupware server, as defined by SMTP Routes.

Private Listener (outgoing email) - The private listener receives connections from a limited 
number of internal groupware servers and directs messages to many external mail hosts.

Internal groupware servers are configured to route outgoing mail to the Cisco C- or X-Series 
appliance.

The Email Security appliance accepts connections from internal groupware servers based on 
settings in the HAT. By default, the HAT is configured to RELAY connections from all internal 
mail hosts.

You can segregate incoming and outgoing email traffic over separate listeners and on separate IP 
addresses. You can use Internet Protocol version 4 (IPv4) and version 6 (IPv6) addresses. However, the 
System Setup Wizard on the appliance supports initial configuration of the following configurations:

2 separate listeners on 2 logical IPv4 and 2 IPv6 addresses configured on separate physical 
interfaces

segregates incoming and outgoing traffic

you can assign an IPv4 and an IPv6 address to each listener

1 listener on 1 logical IPv4 address configured on one physical interface

combines both incoming and outgoing traffic

you can assign both an IPv4 and an IPv6 address to the listener

Configuration worksheets for both one and two listener configurations are included below (see 

). Most configuration scenarios are represented by one of the 

following three figures.