Stop a group of users communicating with each other

[AB21805]

Hi all,

What is the best way to stop a specific group of users communicating with each other? 

[#2]

Take a look at Information barriers: https://learn.microsoft.com/en-us/purview/information-barriers
If you need to also restrict email communication, use mail flow rules.

[#3]

Thank you @Vasil Michev 

With Mail Flow Rules how does the priority work? As we had this set already but then it stopped working however I have increased the priority for this now but will this mean other rules will be affected and potentially stop working? 

[#4 · Accepted solution]

Increasing the number value means the rule gets executed only after all the ones with lower value do. So if any of the "lower" priority rules halts processing or affects the message in a way that causes the new rule to skip it, you should adjust the priority.