X-Google-DKIM-Signature

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About

X-Google-DKIM-Signature is a header item which appears in most or all email messages sent by Gmail (including automated forwards). Its meaning does not appear to be officially documented, though it seems likely it is used by Gmail to ensure that legitimate replies to messages sent through Gmail will be accepted as legitimate regardless of any other indications which might otherwise cause Gmail to reject or spam-folder the message.

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...»
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