Does anyone know exactly where the filtering is in O365 that can be adjusted to lessen header size?  Also where are these Transport rule options?




Our messaging group looked at this and is going to lessen the header size by adjusting some filtering available in Office 365. What appeared to have happened was Microsoft developed a new enthusiasm for email diagnostics and spam prevention.  The newer products became header heavy without an awareness of the impact on other email systems. My guess at least.
 
I was looking thru some of the Transport Rule options and I might have found a solution.
It appears I am able to strip out individual header entries
Now the challenge is to figure out which header entries are huge and mostly unnecessary

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