Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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Lines such as the following are added to the mail logs upon DKIM verification:

mail.current:Mon Aug  6 13:35:38 2007 Info: MID 17 DKIM: no signature

mail.current:Mon Aug  6 15:00:37 2007 Info: MID 18 DKIM: verified 

pass

When you verify DKIM mail, an Authentication-Results header is added to the 
mail, but the mail is accepted regardless of the authentication result. To configure 
actions based on these authentication results, you can create a content filter to 
perform actions on the DKIM-verified mail. For example, if DKIM verification 
fails, you may want configure the mail to be delivered, bounced, dropped, or sent 
to a quarantine. To do this, you must configure an action using a content filter. 

To add an action from the GUI, complete the following steps:

From Mail Policies > Incoming Filters, click Add Filter

In the Conditions section, click Add Condition

Select DKIM Authentication.