Overview of Sophos Email Appliance 4.2.2 release:
The rollout of the Sophos Email Appliance version 4.2.2 has started, this marks first phase in our goal of a single anti-spam engine for all Sophos email solutions. Sophos Email Appliance version 4.2.2 incorporates the latest Sophos Anti-Spam engine as well as improvements to Sophos Delay Queue scanning to improve protection against snowshoe spam.
Full release notes available here
[Required] Outbound from appliance to internet
If you are using a third party web proxy with HTTPS scanning enabled, please exempt the following Sophos URLs from HTTPS scanning. This will prevent any errors when updating the Sophos Email Appliance:
The official Sophos article is available here: https://community.sophos.com/kb/en-us/127433