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In an email forensic study, I want to know the meaning of the field "X-UI-Sender-Class" in email header and how can we decode this information. Note: the email is sent from mail.com Email server through mout.gmx.com

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    Like similar other headers (like UI-InboundReport, X-SG-EID, X-SG-ID, ...) this is a vendor specific header, where the exact meaning is only known to the vendor (in this case GMX) and can also change whenever they like. Commented Nov 1, 2024 at 19:03
  • This isn't a security question even if you ran into this problem in a forensics class Commented Nov 1, 2024 at 21:12

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