Cisco Cisco Email Security Appliance C370D

IronPort does not generally support the backward compatibility of configuration 
files with previous major releases. Minor release support is provided. 
Configuration files from previous versions may work with later releases; however, 
they may require modification to load. Check with IronPort Customer Support if 
you have any questions about configuration file support. 

When you configure AsyncOS to use received headers, you can specify that the 
header reflects one of the following hostnames:

The hostname of the Virtual Gateway used for delivering the message

The hostname of the interface the message is received on

You specify the hostname from the CLI command listenerconfig-> setup. You 
cannot configure the hostname from the GUI.

If you configure the received header to display the hostname of the interface the 
message is received on, a strip-header filter action configured to strip received 
headers will strip the received header inserted by AsyncOS. [Defect IDs: 16254, 
25816] 

The AsyncOS appliance checks for and applies feature keys at one minute 
intervals. Therefore, when you add a feature key, it may take up to a minute to 
view the changes. [Defect ID: 29160]

For the AsyncOS 7.5 release, please use the following instructions to upgrade 
your Email Security appliance.

Save the XML configuration file off the IronPort appliance. 

If you are using the Safelist/Blocklist feature, export the Safelist/Blocklist 
database off the IronPort appliance.