DKIM Validator

This tool will help you to validate a published DKIM record for a given domain. Just enter the selector value along with the domain name to retrieve a public key and authenticate the validity of a message.

What is DKIM?

DKIM (Domain Keys Identified Mail) is an email authentication technique that allows someone to check and confirm whether an email they have received was actually sent and authorized by the owner of a domain. This is done by giving the email a digital signature called the DKIM signature which is added to a message and encrypted. DKIM helps by detecting forgery and protecting from email spam and possible phishing attacks.

How to find DKIM Selector?

A DKIM selector is part of the DKIM record and it's purpose is to allow the publishing of multiple DKIM keys on any domain. To find a DKIM selector please follow the steps given below:

  • Send an email to yourself from the source whose DKIM selector you wish to find.
  • When you open the email, view the raw message content of the mail. This option will allow you to view a lot of information including the DKIM authentication results. E.g. If you are using gmail, select the "show original" option of the email to view the raw message, or if you are using Yahoo, you can see this option under "View raw message".
  • Search for "DKIM-Signature" to view the applied signature of the email. Here take the value given next to "s=". This is the selector used.