Cisco Cisco Email Security Appliance C170 Guia Do Utilizador
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Cisco AsyncOS 8.0.2 for Email User Guide
Chapter 21 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
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 Cisco appliance listener to MTA(s) for
the domain. If the negotiation fails, no email will be sent through the connection. For more information,
see
setting is specified, a TLS connection will be negotiated from the Cisco 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 21-8
Values in the Destination Controls Table
Field
Description
Concurrent
Connections
Connections
The maximum number of outbound connections that will be made by the Cisco
appliance to a given host. (Note that the domain can include your internal groupware
hosts.)
appliance to a given host. (Note that the domain can include your internal groupware
hosts.)
Maximum
Messages Per
Connection
Messages Per
Connection
The maximum number of messages allowed for a single outbound connection from the
Cisco appliance to a given host before initiating a new connection.
Cisco 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.
denotes that there is no recipient limit for the given domain.
The minimum period of time — between 1 and 60 minutes — that the Cisco appliance
will count the number of recipients. Specifying a time period of “0” disables the
feature.
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.
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.)
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.
address.
Note