X-Google-DKIM-Signature
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notes
- How to View and Analyze Gmail Message Header says: «In addition to various authentications, Google itself adds an X-Google-DKIM Signature field in email header to improve authentication of signatures. The subsequent fields located within the field signifies the information related to digital signatures encoding.» It also gives a breakdown of the terms used.
- 2013-02-14 How did spammer spoof emails with my google apps domain (it even has DKIM!) «Don't worry about X-Google-DKIM-Signature (or any other headers prepended with X- in general), this one is Gmail specific and it is not a real DKIM signature for your domain. If you want to set up one, review the following article...»