Cisco Cisco Email Security Appliance C190 Guía Del Usuario
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Cisco AsyncOS 8.5.5 for Email Security User Guide
Chapter 23 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 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 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 23-8
Values in the Destination Controls Table
Field
Description
Concurrent
Connections
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.)
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
appliance to a given host before initiating a new connection.
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 appliance will
count the number of recipients. Specifying a time period of “0” disables the feature.
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
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
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