Cisco Cisco Email Security Appliance C160 Mode D'Emploi

AsyncOS provides several methods for rewriting Envelope Sender and Recipient 
addresses in the email pipeline. Rewriting addresses can be used, for example, to 
redirect mail sent to a partner domain or to hide (“mask”) your internal 
infrastructure.

 provides an overview of the various features used for rewriting sender 

and recipient email addresses.

*@anydomain

user@domain

Alias Tables (see 

)

Envelope Recipients 
only

Applied globally

Maps aliases to 
email addresses or 
other aliases

*@olddomain

*@newdomain

Domain Mapping 
(see 

)

Envelope Recipients 
only

Applied per listener

*@olddomain

*@newdomain

Masquerading (see 

)

Envelope Sender and 
the To:, From:, 
and/or CC: headers

Applied per listener

Alias tables provide a mechanism to redirect messages to one or more recipients. 
You can construct a mapping table of aliases to usernames and other aliases in a 
similar fashion to the 

/etc/mail/aliases

 feature of a sendmail configuration on 

some Unix systems.