DKIM error code : 550 bodyhash_mismatch

Products

• Email Security.cloud

Issue/Introduction

While sending an outbound email, You may encounter in certain situations an error code :  550 bodyhash_mismatch  or  550-DKIM: encountered the following problem validating  Domain : example.com

Environment

Email Security.cloud

Cause

Common causes include:

1 - Email content changes: Modifications to the email's body, such as adding or removing content, inserting tracking pixels, or changes introduced by forwarding or spam filters, can invalidate the signature. 
2 - Incorrect DKIM configuration: Problems with the sender's DKIM setup, including incorrect DNS records or issues with the signing process, can also lead to this error.
3 - Spoofing: In rare cases, someone might try to spoof an email and sign it with a forged DKIM signature, which would also lead to a mismatch.

Note : A "550 bodyhash_mismatch" error means the email is permanently rejected by the recipient's server and won't be delivered.

 

Resolution

To fix this, you need to:

1 - Verify your DKIM setup: Ensure your DNS records are correctly configured and that the signing process is working as expected.

2 - Investigate content changes: Identify any potential points where the email content might be modified (e.g., forwarding servers, spam filters) and ensure those changes don't invalidate the DKIM signature. 

3 - Consider DKIM alignment: Ensure that the domain used for DKIM signing matches the domain in the "From" header.

4 - Use a DKIM checker: Tools like EasyDMARC's DKIM Checker can help you verify the validity of your DKIM signature and identify potential issues.