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We do not have DKIM enable for our tenant. One of the recipient is not receiving our emails and we are getting below NDR.
Dear Sender,
We have noticed that the email sent from your domain is failing DKIM key, hence 'DKIM Failure and email is not delivered to Recipient'
FILTER HAS QUARANTINED THE FOLLOWING MESSSAGE:
Please suggest how to fix this.
A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
Answer accepted by question author
in that case, either the message is phony or you would need to open a case with Microsoft support.
Do you know that its real? If you have no DKIM record ( why not?) then you can probably just ignore it.
However, you should really set it up
Hello Andy,
If i am sending email from outlook , by default it uses DKIM key of onmicrosoft.com domain. So according to me there should ne no chance of this type of NDR. Please suggest.