DKIM (DomainKeys Identified Mail) is an email authentication method that allows the sender to verify the authenticity of their email message. It uses a digital signature linked to the sender’s domain, helping recipients confirm the email’s origin and integrity.
DKIM works by adding a digital signature to the header of an email. This signature is created using a private key on the sender’s mail server. The recipient’s mail server then checks this signature using the sender’s public key (published in the DNS) to confirm that the email is authentic and hasn’t been tampered with.
If your DKIM check fails, it can indicate that the email has been tampered with or that the signature does not match the sender’s domain. In some cases, it may lead to your email being marked as spam or rejected by the recipient’s mail server. It’s important to troubleshoot the issue, typically by ensuring proper DNS configurations and correct DKIM signing.
Once you update your DNS records with a DKIM key, it can take anywhere from a few minutes to 72 hours for the changes to propagate across the internet. Be patient and verify the changes once they’ve had time to take effect.
Yes, many email marketing services support DKIM and allow you to configure it for your sending domain. You’ll need to follow the service’s instructions to ensure the correct DKIM keys are added to your DNS records for authentication.