Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Because quarantined messages are rescanned whenever new rules are published, 
it is very likely that messages in the Outbreak quarantine will be released prior to 
the expiration time.

Still, it can be important to monitor the Outbreak quarantine if the Default Action 
is set to Delete. Cisco recommends most users to not set the default action to 
Delete. For more information about releasing messages from the Outbreak 
quarantine, or changing the Default Action for the Outbreak Quarantine, see the 
“Quarantines” chapter in the Cisco IronPort AsyncOS for Email Daily 
Management Guide.

Conversely, if you have messages in your Outbreak quarantine that you would like 
to keep in the quarantine longer while you wait for a new rule update, for example, 
you can delay the expiration of those messages. Keep in mind that increasing the 
retention time for messages can cause the size of the quarantine to grow.

If anti-virus scanning is disabled globally (not via a mail policy) while a message 
is in the Outbreak quarantine, the message is not anti-virus scanned when it leaves 
the quarantine, even if anti-virus scanning is re-enabled prior to the message 
leaving the quarantine.

You can use the Outbreak Filters feature without having enabled anti-virus 
scanning on the Cisco IronPort appliance. However, Outbreak Filters cannot scan 
for non-viral threats if anti-spam scanning is not enabled on the appliance.

You can view the contents of the Outbreak quarantine by clicking on the name of 
the quarantine in the listing on the Monitor menu in the GUI. The Outbreak 
quarantine has an additional view as well, the Outbreak Quarantine Manage by 
Rule Summary link.