Email authentication is a system whereby a signature in an email header matches a certificate in the domain name system (DNS), thus certifying the message's origin. "
There are three major steps required to add the DKIM signature to outgoing mail:
- Generate the domain key for your domain
- Add the public domain key to the DNS records for your domain, so that recipients can retrieve it for decrypting the DKIM header
- Turn on authentication to begin adding the DKIM header to outgoing mail messages."
More here, from Google blogs.
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