Forum Discussion
Block outbound RMS Encrypted Emails with Exchange Transport Rule?
Circling back on this - we worked with MSFT Support and they confirmed it no longer works using rpmsg.message.
They work-around they provided, which we confirmed works, is checking for a message type that is "Permission Controlled"
Funny, customers usually care about the opposite scenario :)
I believe the "encrypted" option for message type refers to S/MIME, for RMS/AIP protected messages try creating a rule that looks the following header - Content-Class: rpmsg.message
Or the "msip_labels" header, but that's only added when manually labeling the email I suppose.
It does not seem to be blocking it. Does this rule look right to you? If so, shouldn't the rule take effect in ~15 minutes? It has been 45 minutes.
You probably have to "sanitize" it, as the . symbol has special meaning when using regex ("matches"). Or just try the "header includes words" condition.
Tried using 'header includes words' to avoid the regex and it still is not blocking the emails.
I verified that on the receiving end, there is a message header called Content-Class that contains the value rpmsg.message so not sure why the rule is not working.
