Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

encrypted data. It does not detect password protected ZIP files, or Microsoft Word 
and Excel documents that include encrypted content. The virus scanning engine 
considers any message or attachment that is password protected to be “encrypted.” 

If you upgrade from a 3.8 or earlier version of AsyncOS and you configured 
Sophos Anti-Virus scanning, you must configure the Encrypted Message 
Handling section after you upgrade.

Messages are considered unscannable if a scanning timeout value has been 
reached, or the engine becomes unavailable due to an internal error. Messages that 
are marked unscannable may also be repaired.

The system may be unable to drop the attachment or completely repair a message. 
In these cases, you can configure how the system handles messages that could still 
contain viruses. 

The configuration options are the same for encrypted messages, unscannable 
messages, and virus messages.

Choose which overall action to take on each message type for encrypted, 
unscannable, or virus positive messages: drop the message, deliver the message 
as an attachment to a new message, deliver the message as is, or send the message 
to the anti-virus quarantine area (

). See the “Quarantines” chapter in Cisco IronPort AsyncOS for Email 

Daily Management Guide for more information about quarantines.

Configuring the appliance to deliver the infected messages as an attachment to a 
new message allows the recipient to choose how to deal with the original, infected 
attachment.