Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

A domain context is a list of one or more domains or partial domains, separated by commas and enclosed 
in square brackets ('

[

' and '

]

'). A domain is a string containing letters, digits hyphens, and periods as 

defined in RFC 1035, section 2.3.1., “Preferred name syntax.” A partial domain, such as 

.example.com

 

is a domain that begins with a period. All domains that end with a substring matching the partial domain 
are considered a match. For example, the domain context 

.example.com

 would match 

mars.example.com

 and 

venus.example.com

. Below the domain context is a list of maps, which are 

aliases followed by a list of recipients. A map is constructed as follows:

An alias in the left-hand side can contain the following formats:

You can enter multiple aliases, separated by commas on a single left-hand side line. 

Each recipient in the right-hand side can be a full 

user@domain

 email address, or another alias.

An alias file can contain “global” aliases (aliases that are applied globally instead of to a specific 
domain) with no implied domain, domain contexts within which aliases have one or more implied 
domains, or both.

 “Chains” (or recursive entries) of aliases may be created, but they must end in a full email address.

A special destination of 

/dev/null

 is supported to drop the message in order to be compatible with 

context of a sendmail configuration. If a message is mapped to 

/dev/null

 via an alias table, the dropped counter is increased. (See the “Managing and Monitoring via 

the CLI” chapter.) The recipient is accepted but not enqueued.

To import an alias table, first see 

 to ensure that you can 

access the appliance. 

Use the 

export

 subcommand of the 

aliasconfig

 command to save any existing alias table. A file (whose 

name you specify) will be written to the 

/configuration

 directory for the listener. You can modify this 

file outside of the CLI and then re-import it. (If you have malformed entries in the file, errors are printed 
when you try to import the file.) 

Place the alias table file in the 

/configuration

 directory, and then use the 

import

 subcommand of the 

aliasconfig

 command to upload the file. 

Comment out lines in the table using a number symbol (#) at the beginning of each line.

a list of one or more aliases to match 

the colon character 
(“

:

”)

a list of one or more recipient 
addresses or aliases

Specifies an alias to match. There must be a preceding “domains” attribute 
specified in the table. The lack of this parameter will produce an error. 

Specifies an exact email address to match on.