The pre-requisites for Office 365 ATP configuration need to be easily seen by Central administrators.
Neither the help pages or Central admin have any links or make any mention of the pre-requisites for Office 365.
These need to be easily seen by Central administrators - the help pages are unhelpful and entirely lacking in information. A simple reference to the KB URL: https://sophos.com/kb/131747 would solve this and prevent unhappy administrators.
TO QUOTE from the existing help pages : https://docs.sophos.com/central/Customer/help/en-us/central/Customer/concepts/PhishThreatSettings.html
Sending domains and IPs
Here you can see the domains and IP addresses used for sending campaign email from Phish Threat.
Note You must allow mail and web traffic to and from these IPs and domains on your email gateway, web proxy, firewall appliance, or anywhere else in your environment where mail and web filtering is done.
This list will be updated when we add new domains. See the Sophos Central What’s New? for news on new domains.