dkim: FAILED Author+Sender+MailFrom signature by d=gmail.com, From: <aco1967@gmail.com>, a=rsa-sha256, c=relaxed/relaxed, s=20161025, i=@gmail.com, invalid (public key: DNS error: no nameservers)

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dkim: FAILED Author+Sender+MailFrom signature by d=gmail.com, From: <aco1967@gmail.com>, a=rsa-sha256, c=relaxed/relaxed, s=20161025, i=@gmail.com, invalid (public key: DNS error: no nameservers)

Roberto Carna
Dear, I've a Postfix server where I've implemented DKIM for incoming mails.

While receiving mails, I'm seeing the /var/log/zimbra.log file and I can see a type of error as in below case corresponds to a mail sent from Gmail to my Zimbra account:

dkim: FAILED Author+Sender+MailFrom signature by d=gmail.com, From: <[hidden email]>, a=rsa-sha256, c=relaxed/relaxed, s=20161025, i=@gmail.com, invalid (public key: DNS error: no nameservers)

I confirm that in my Postfix server I have DNS resolution.

What can be the problem ? How can I put DKIM to work for incoming messages ?

Special thanks.

Robert.