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Difference between Authentication-Results and X-MS-Exchange-Authentication-Results email headers

zm flag

I am using Outlook for my company and I got an email from an external domain. I have analyzed the email headers and the email headers have two headers:

  • Authentication-Results
  • X-MS-Exchange-Authentication-Results

Can someone help me understand the difference between both of the headers and what happens if both headers are present in email headers? Which header takes priority/overrides the other header?

Can O' Spam avatar
cn flag
You have asked the exact same question on [InformationSecurity](https://security.stackexchange.com/questions/271651/difference-between-authentication-results-and-x-ms-exchange-authentication-resul)
Bharath Naidu Yenumula avatar
zm flag
@CanO'Spam as i did not know what platform answers the question, i asked on both. Sorry if i made a mistake.
schroeder avatar
ve flag
Closed on Sec.SE
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