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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 suppose, otherwise every spammer out there can just add them to their messages. Use a transport rule instead.
The behavior makes perfect sense.
I was trying to avoid employing a transport rule and move the processing upstream. I am going to test it via a transport rule instead, now that I remembered how to have a rule fire on a specific header value.