Cisco Cisco Email Security Appliance C160 Guía Del Usuario
21-28
Cisco AsyncOS 8.0.1 for Email User Guide
Chapter 21 Configuring Routing and Delivery Features
The Domain Map Feature
Note
The processing of the domain map feature happens immediately before the RAT and right after Default
Domain is evaluated. Refer to “Understanding the Email Pipeline” in the Cisco IronPort AsyncOS for
Email Configuration Guide.
Domain is evaluated. Refer to “Understanding the Email Pipeline” in the Cisco IronPort AsyncOS for
Email Configuration Guide.
A common implementation of the domain map feature is to accept incoming mail for more than one
legacy domain. For example, if your company has acquired another company, you could construct a
domain map on the Cisco appliance to accept messages for the acquired domain and rewrite the Envelope
Recipients to your company’s current domain.
legacy domain. For example, if your company has acquired another company, you could construct a
domain map on the Cisco appliance to accept messages for the acquired domain and rewrite the Envelope
Recipients to your company’s current domain.
Note
You can configure up to 20,000 separate, unique domain mappings.
In the following example, the
domainmap
subcommand of the
listenerconfig
command is used to
create a domain map for the public listener “InboundMail.” Mail for the domain and any subdomain of
oldcompanyname.com
is mapped to the domain
example.com
. The mapping is then printed for
confirmation. Contrast this example with the configuration of placing both domains in the listener’s
RAT: the domain map feature will actually rewrite the Envelope Recipient of
RAT: the domain map feature will actually rewrite the Envelope Recipient of
joe@oldcomapanyname.com
to
joe@example.com
, whereas placing the domain
oldcompanyname.com
in the listener’s RAT will simply
accept the message for
joe@oldcompanyname.com
and route it without rewriting the Envelope Recipient.
Also, contrast this example with the alias table feature. Alias tables must resolve to an explicit address;
they cannot be constructed to map “any username
they cannot be constructed to map “any username
@domain
” to
“the same username
@newdomain
.”
Table 21-4
Domain Map Table Example Syntax
Left Side
Right Side
Comments
username@example.com
username2@example.net
Only complete address for the
right side
right side
user@.example.com
user2@example.net
@example.com
user@example.net
or
@example.net
Complete address or
fully-qualified domain name.
fully-qualified domain name.
@.example.com
user@example.net
or
@example.net
mail3.example.com> listenerconfig
Currently configured listeners:
1. Inboundmail (on PublicNet, 192.168.2.1) SMTP TCP Port 25 Public
2. Outboundmail (on PrivateNet, 192.168.1.1) SMTP TCP Port 25 Private
Choose the operation you want to perform: