The Test-Message cmdlet is a useful tool to check if Exchange transport rules and DLP policies work correctly. You can input a test message to see what happens as the Exchange transport service applies transport rules, DLP policies, and auto-label policies based on the message contents and properties. Nice as it is to have the Test-Message cmdlet, human knowledge of what transport rules should do is probably an even more important asset.
Microsoft is moving the creation and management of mail flow rules to the new EAC from November. The UX in the legacy EAC should disappear in December 2022. The new UX is prettier and works better (apart from the rule wizard), but it’s a little disappointing that we have essentially the same way of managing mail flow rules in 2022 as we had in 2006. You can only hope that things might improve in the future.
Exchange Online transport (mail flow) rules are a powerful way to manipulate messages as they pass through the transport system. In this example, we look at how to BCC messages sent by some employees for management review. I’m not sure that this is a good idea (for many reasons), but the need does exist to copy messages automatically, so we explore the use of transport rules as a solution.