Cisco Cisco Email Security Appliance C160

 lists the known issues in this release of AsyncOS for Email.

72743

AsyncOS 7.6 has been updated to use OpenSSH 5.4 in order to fix the 
CVE-2008-5161 vulnerability.

72524

Previously, mail agents such as Outlook and Thunderbird displayed a disclaimer as an 
attachment and not inline with the message because the message body was not 
encoded as US-ASCII. This issue has been resolved. This disclaimer is now displayed 
inline with the message even if the message body is encoded in a format other than 
US-ASCII.

78019

In AsyncOS 7.5, AsyncOS upgrades used the same update server as all of the service 
updates, whether it was an IronPort update server or a local update server. This 
prevented users from using a local server for AsyncOS upgrades and an IronPort 
update server for all other service updates unless they configure the appliance to use 
a manifest on a local appliance for an AsyncOS upgrade and then re-configure the 
appliance to use an IronPort update server for the other services after the upgrade is 
complete.

This issue has been resolved. AsyncOS 7.6 allows you to specify a different update 
server for AsyncOS upgrades than the one used for other service updates, such as 
feature key updates, outbreak filters, and time zone rules. 

75046

Previously, AsyncOS for Email may not have signed outgoing messages using DKIM 
if the appliance uses a Virtual Gateway hostname in the received header. This issue 
has been resolved.

55066, 37034

Previously, when you performed a query, the GUI sometimes displayed fewer results 
per page than expected. For example, if you selected to view 50 items of your query 
results per page, the GUI may have displayed only 20 per page, even though the page 
may have said "Displaying 1-50 of 120 items." This issue has been resolved