Cisco Cisco Email Security Appliance X1070 Mode D'Emploi
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User Guide for AsyncOS 10.0 for Cisco Email Security Appliances
Chapter 26 Configuring Routing and Delivery Features
Controlling Email Delivery Using Destination Controls
If the destination is not local, packets are sent to the default router (set via the Network > Routing page
or with the
or with the
setgateway
command). The IP address of the default router is local. The output interface is
determined by the rule for selecting the output interface for local addresses. For example, AsyncOS
chooses the most specific IP address and netmask that include the default router's IP address.
chooses the most specific IP address and netmask that include the default router's IP address.
The routing table is configured via the Network > Routing page (or via the
routeconfig
command). A
matching entry in the routing table takes precedence over the default route. A more specific route take
precedence over a less specific route.
precedence over a less specific route.
Default Delivery Limits
Each outbound destination domain has its own outbound queue. Therefore, each domain has a separate
set of concurrency limits as specified in the Destination Controls table. Further, each unique domain not
listed specifically in the Destination Controls table uses another set of the “Default” limits as set in the
table.
set of concurrency limits as specified in the Destination Controls table. Further, each unique domain not
listed specifically in the Destination Controls table uses another set of the “Default” limits as set in the
table.
Working with Destination Controls
Use the Mail Policies > Destination Controls page in the GUI or the
destconfig
command in the CLI to
create, edit, and delete Destination Control entries.
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Controlling the Version of Internet Protocol Addresses
You can configure which version of Internet Protocol addresses to use for the connection to a domain.
The Email Security appliance uses both Internet Protocol version 4 (IPv4) and Internet Protocol version
(IPv6). You can configure a listener on the appliance to use one version of the protocol or both.
The Email Security appliance uses both Internet Protocol version 4 (IPv4) and Internet Protocol version
(IPv6). You can configure a listener on the appliance to use one version of the protocol or both.
If the “Required” setting for either IPv4 or IPv6 is specified, the appliance will negotiation a connection
to the domain using an address of the specified version. If the domain doesn’t use that IP address version,
no email will be sent. If the “Preferred” setting for either IPv4 or IPv6 is specified, the appliance will
first attempt to negotiation a connection to the domain using an address of the specified version then fall
back to the other if the first is not reachable.
to the domain using an address of the specified version. If the domain doesn’t use that IP address version,
no email will be sent. If the “Preferred” setting for either IPv4 or IPv6 is specified, the appliance will
first attempt to negotiation a connection to the domain using an address of the specified version then fall
back to the other if the first is not reachable.
Controlling the Number of Connections, Messages, and Recipients to a Domain
You may want to limit how your appliance will deliver email to avoid overwhelming remote hosts or your
own internal groupware servers with email from your appliance.
own internal groupware servers with email from your appliance.