dkim check online

  1. send an email message to:

    dkim@tester.realsender.com
    
  2. check online the DKIM validation results:
    (it will take a minute to appear)

    https://tester.realsender.com/dkim
    


RealSender DKIM check online will add a subject prefix, if the message has not been signed correctly:

!! dkim-none !!      no DKIM-Signature headers (valid or invalid) were found  
!! dkim-fail !!      a valid DKIM-Signature header was found, but the signature does not contain a correct value for the message  

Sometimes it’s not possible to execute the check:

!! dkim-invalid !!   there is a problem in the signature itself or the public key record. I.e. the signature could not be processed
!! dkim-temperror !! some error was found which is likely transient in nature, such as a temporary inability to retrieve a public key

When the message has been signed using a different domain, a “diff” alert will be added to the subject.
This warning will NOT be displayed if the sender passes the SPF check:

!! dkim-diff !!      the message has NOT been signed by the sender's domain


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