PowerDMARC

Fix “DKIM none message not signed” – A Troubleshooting Guide

Yunes Tarada
How to fix “DKIM none message not signed”

To avoid errors such as “DKIM none message not signed” you must generate and maintain an error-free DKIM record with proper configurations for uncompromised email security.

This blog explores ways to fix the error you get when your message is not signed with DKIM, which might be caused due to multiple reasons, including a misconfigured or invalid or missing public key in your DNS. 

Key Takeaways

  1. The “DKIM none message not signed” error occurs when emails lack a valid DKIM signature, often due to configuration issues or missing records.
  2. Enabling DKIM in your email service settings ensures outgoing emails are properly signed and protected from tampering.
  3. Misconfigured DNS or syntax errors in the DKIM record are common causes of authentication failures and should be addressed promptly.
  4. Generating and publishing accurate DKIM TXT records in your DNS is essential for effective email authentication.
  5. Regularly verify DKIM functionality by checking email headers for pass or fail results to ensure your setup is working correctly.

Possible Reasons for “DKIM none message not signed” and How to Fix Them?

1. DNS Not Hosted Locally

It’s advised to host DNS locally to have better control over your network and for proper DKIM configuration. It also enables you to centralize DKIM settings across the network stack.

Follow these steps to fix it:

2. DKIM Configuration Errors

Syntactical and configuration errors in your DKIM record cause DKIM failures. You can set your record by following these steps.

Ensure that DKIM public key record is correctly published in the DNS. It’s suggested to copy-paste it instead of manually typing it, as it’s a combination of numbers, special characters, and both uppercase and lowercase letters. Other than this, to prevent a “DKIM none message not signed” error, you must avert the practice of widespread key sharing as simplified and sorted configuration of shared keys is a vulnerability that hackers can take advantage of.

Also, validate the header of all outgoing emails; it should look like the following:

Simplify DKIM with PowerDMARC!

3. DKIM Not Enabled in Email Settings

To perform cryptography-based authentication checks, you need to enable DKIM in email settings. This way, the domain will attach special headers with every email sent from your domain containing a private key. This key will be matched with the publicly available key to verify the senders’ authenticity. This also ensures that no malicious entity tampered with your messages’ content in transit. 

Enabling DKIM in Gmail or Google Workspace

Here’s how you can enable DKIM in email settings in your Google Admin Console:

Once done, verify if DKIM authentication is on by following these steps:

If the email header doesn’t include a statement about DKIM, it means that the DKIM message was not signed. In this case, verify all the steps or reach out to an expert. You can use our email header analyzer tool for a detailed and quick analysis. 

Enabling DKIM in Microsoft Office 365

Here’s how you can enable DKIM in email settings for Microsoft Office 365:

4. Missing Record

When you come across the “No DKIM record found” error, it means your domain has failed to configure to DKIM email authentication standards. To get rid of this prompt, you need to configure DKIM for your domain by publishing a DNS TXT record using our DKIM record generator that can instantly produce a record with the correct syntax. 

Here’s what you need to do:

If you’re still facing issues in resolving “DKIM none message not signed”, contact us for immediate assistance with your email authentication practices.

 

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