It’s crucial to investigate all sources appearing in the failed section to identify them as valid or malicious. You need at least one protocol to pass for the DMARC to pass. If SPF alignment also failed, DMARC alignment will not work as well. If the DKIM alignment failed, the chances of passing DMARC get smaller. The public key published by the email sender in their DNS is incorrect.The public key specified in the DKIM-Signature header is incorrect.Someone spoofed the email and signed it without having the correct private key.The signer calculated the signature value incorrectly.Several other reasons may cause DKIM=neutral (“body hash did not verify”) If it fails, content alteration in transit becomes possible, resulting in DKIM failure. Transport Layer Security (TLS) Issues: The main point of TLS is to secure email in transit.As they scan for spam or malware, they might change the email content, causing the discrepancy. Email Gateway Interference: Sometimes, a DKIM fail happens because of an email gateway or a security system.A DKIM check would return invalid results. If the change happens after applying the DKIM check, the DKIM signature can not be verified. Email Content Changes: As mentioned above, some corporate email servers attach inline text to the bottom of incoming emails.There are several reasons DKIM fails, and the “body hash did not verify” error pops up: The “DKIM body hash not verified” status means the computed hash of the message body doesn’t correspond to the body hash value stored in the “bh=” tag of the DKIM signature. Sign up Why Do I See DKIM=Fail (“Body Hash Did Not Verify)? Regardless of the reason, a DNS downtime can cause a DKIM fail. DNS outage reasons vary, but DDoS attacks, DNS misconfiguration, and connectivity occur most often. If your DKIM authentication failed, there’s a chance that it’s because of a DNS outage or downtime. We’ll talk more in-depth about this error and how to fix it later in the article.

This might result in the DKIM verification result “dkim=neutral (DKIM signature body hash not verified).” Sometimes, this interferes with DKIM verification. Mail Transfer Agents (MTAs) can alter the original email while adding the compliance footer text to the received email before auto-forwarding. This approach will help you avoid DKIM verification failures. It’s crucial to ensure stable communication between servers at all times. Whether it’s DNS resolution timeouts or failures, network connectivity problems, or port blocking, some server issues can cause a DKIM fail. As DKIM configuration combines a private and public key, each ESP maintains a unique private key and shares a public key you can use. No DKIM Configured for Third-Party ServicesĮach email vendor has their own instructions to configure DKIM on outbound emails. In these cases, the domain owner must ensure that no interference can disrupt DKIM authentication.

Email header changes by some email gateways or security systems.

Email header changes by some mailing list services.

The “From” header modification during email forwarding.

Incorrect configuration of DKIM settings or DNS records.

There are three alignment options: strict, relaxed, and no alignment.ĭKIM alignment failures can happen for several reasons:

This issue occurs when the alignment between the “From” header domain and the domain specified in the DKIM signature fails. The easiest way to avoid this issue is to use a trusted DKIM record generator. Syntax ErrorsĭKIM record is a string of text, and one error could lead to misconfiguration. This section dives into seven reasons this DMARC fails to happen. Occasionally, DKIM verification can fail, leaving emails vulnerable to potential threats. This article explores the implications of DKIM fail and offers steps to resolve any DKIM issues. Examples include inserting malicious links, compromising sensitive information, and infecting systems with malware.

This protocol blocks any attempts at email spoofing and forgery. It uses cryptographic signatures to verify that an email message comes from the claimed sender domain. Thus, a DKIM fail can result in phishing, spoofing, and man-in-the-middle attacks.ĭKIM verifies email integrity. DomainKeys Identified Mail (DKIM) is one of three protocols leading to full DMARC record compliance.

In the digitized world, email authentication is crucial in safeguarding sensitive information.

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