Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

AsyncOS enables you to add encryption settings to a message by inserting an 
SMTP header into a message using either a content filter or a message filter. The 
encryption header can override the encryption settings defined in the associated 
encryption profile, and it can apply specified encryption features to messages.

To add an encryption header to a message by using a content filter, add the Add 
Header filter action to the content filter, and enter the encryption header and its 
value. For example, if you want a Registered Envelope to expire in 24 hours after 
you send it, type 

X-PostX-ExpirationDate

 as the header name and 

+24:00:00

 

as the header value.