Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Uncontrolled high-volume email delivery can overwhelm recipient domains. 
AsyncOS gives you full control of message delivery by defining the number of 
connections your appliance will open or the number of messages your appliance 
will send to each destination domain.

Using the Destination Controls feature (Mail Policies > Destination Controls in 
the GUI, or the 

destconfig

 command in the CLI), you can control:

Concurrent Connections: number of simultaneous connections to remote 
hosts the appliance will attempt to open.

Maximum Messages Per Connection: number of messages your appliance 
will send to a destination domain before the appliance initiates a new 
connection.

Recipients: number of recipients the appliance will send to a given remote 
host in a given time period.

Limits: how to apply the limits you have specified on a per-destination and 
per MGA hostname basis.

Whether TLS connections to remote hosts will be accepted, allowed, or 
required (see 

Whether to send an alert when TLS negotiation fails when delivering a 
message to a remote host that requires a TLS connection. This is a global 
setting, not a per-domain setting.

Assign a TLS certificate to use for all outbound TLS connections to remote 
hosts.

Whether or not to perform address tagging via IronPort Bounce Verification 
(see