Let’s look into some of the possible reasons for “DMARC Unauthenticated Mail Is Prohibited”, along with its solution in this article. At Bobcares, with our Server Management Service, we can handle your issues.

“DMARC Unauthenticated Mail Is Prohibited” Error

This error may appear if we are using unapproved servers to send messages while using a DMARC reject policy. Other possible causes include misconfiguring the email authentication records and using free domains to route emails.

In this article, we’ll look into some of the possible causes and solutions for fixing the error.

Cause 1

We are using an unapproved server to send emails.

Solution: By verifying that the server hosting the account and the email address provider are on the same network, we can solve this issue.

Cause 2

When we are using free domains to relay emails, it can lead to this error.

Solution: We advise switching the header from reply-to email addresses to a paid service in order to resolve the aforementioned problem. This will guarantee that the emails won’t unintentionally be invalid according to DMARC policy.

Cause 3

All senders are not currently in the SPF setup update.

Solution: We must return to the SPF record and confirm that it corresponds with the email host domain name in order to resolve this problem. Make sure every domain, if we have more than one, is in the SPF record.

Cause 4

No proper setup for the sender’s domain.

Solution: make sure the SPF and DKIM settings are in the domain’s DNS records.

Cause 5

The recipient’s DMARC anti-spam filters block the sender.

Solution: Ask the recipient to change their current DMARC policy.

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Conclusion

We can see 5 different causes and corresponding solutions for the issue in this article.