Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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Cisco AsyncOS 8.5 for Email User Guide
 
Chapter 22      Configuring Routing and Delivery Features
  Controlling Email Delivery Using Destination Controls
These values are explained in 
Note
If limits are applied per each Virtual Gateway address, you can still effectively implement system-wide 
limits by setting the Virtual Gateway limit to the system-wide limit you want divided by the number of 
possible virtual gateways. For example, if you have four Virtual Gateway addresses configured, and you 
do not want to open more than 100 simultaneous connections to the domain 
yahoo.com
, set the Virtual 
Gateway limit to 25 simultaneous connections.
Note
The 
delivernow
 command, when acting on all domains, resets all counters tracked in the 
destconfig
 
command.
Controlling TLS
You can also configure the TLS (Transport Layer Security) on a per-domain basis. If the “Required” 
setting is specified, a TLS connection will be negotiated from the appliance listener to MTA(s) for the 
domain. If the negotiation fails, no email will be sent through the connection. For more information, see 
.
Table 22-8
Values in the Destination Controls Table 
Field
Description 
Concurrent 
Connections
The maximum number of outbound connections that will be made by the appliance to 
a given host. (Note that the domain can include your internal groupware hosts.) 
Maximum 
Messages Per 
Connection
The maximum number of messages allowed for a single outbound connection from the 
appliance to a given host before initiating a new connection.
Recipients
The maximum number of recipients allowed within the given period of time. “None” 
denotes that there is no recipient limit for the given domain. 
The minimum period of time — between 1 and 60 minutes — that the appliance will 
count the number of recipients. Specifying a time period of “0” disables the feature. 
Note
If you change the recipient limit, AsyncOS resets the counters for all messages 
already in the queue. The appliance delivers the messages based on the new 
recipient limit.
Apply Limits
Specifies whether the limit will be applied (enforces) to the entire domain or to each 
mail exchange IP address specified for that domain. (Many domains have multiple MX 
records.) 
This setting applies to connection, message, and recipient limits.
Specifies whether the limit will be applied system-wide or for each Virtual Gateway 
address. 
Note
If you have configured groups of IP addresses, but you have not configured 
virtual gateways, do not configure apply limits per each virtual gateway. This 
setting is intended only for systems configured to use virtual gateways. For 
information on configuring virtual gateways, see