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Using a 3rd Party Email Gateway to Insert X-MS-Exchange-Organization Headers
I wanted to post to confirm a suspicion I have, as I cannot find any solid source of this information elsewhere. Does Exchange Online "strip" or "firewall" the message header of some X-MS-Excha...
I suppose, otherwise every spammer out there can just add them to their messages. Use a transport rule instead.
I was able to create two ETRs to add the headers I need, however, interestingly enough, I cannot see the headers in the actual delivered message. This is in spite of the message trace showing the Transport rule firing to set the header.
I will likely remove the SCL setting from these rules, as it is not required.
They shouldn't be stripped post rule application, but in any case the important thing is that the messages are delivered successfully and bypass ATP checks.
- A few years later I came across this post in trying to hunt down an issue were having that was related.
Thanks for your post clarifying this header value disappears. It does make sense it's removed I'll admit.
However, we're seeing that the header value is not taking into effect as we are trying to scope certain traffic to disable this on and currently we're seeing that the header values are not taking effect.
We have a case open with support with little to no confidence that this will be resolved or even answered.
