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  • 18 Jun 2024

DKIM and DMARC are two email authentication protocols that work together to prevent email spoofing and improve email deliverability. Here’s a breakdown of what each one does:

images 35 What are DKIM and DMARC?
What are DKIM and DMARC? 2

DKIM (DomainKeys Identified Mail):

  • Function: DKIM acts like a digital signature for your emails. It adds a cryptographic signature to the header of your outgoing emails. This signature is based on a secret key known only to your domain and the DKIM service provider.
  • Benefits:
    • Verifies Sender Identity: When an email arrives at a recipient’s server, the recipient’s server can verify the DKIM signature using the public key associated with your domain. This helps confirm that the email actually originated from your domain and not from a spoofed sender address.
    • Protects Sender Reputation: By verifying the legitimacy of your emails, DKIM helps protect your sender reputation and reduces the chances of your emails being marked as spam.

DMARC (Domain-based Message Authentication, Reporting, & Conformance):

  • Function: DMARC builds on top of DKIM. It allows you to set a policy for how email receivers should handle emails that fail DKIM authentication.
  • Benefits:
    • Policy Enforcement: With DMARC, you can specify whether emails failing DKIM checks should be quarantined, rejected, or simply reported. This gives you more control over how to handle potential spoofing attempts.
    • Reporting: DMARC provides reports that show how email receivers are handling your emails, including those that fail DKIM authentication. This valuable information helps you identify potential spoofing attempts and improve your email authentication overall.

Working Together:

DKIM and DMARC work together to provide a comprehensive email authentication solution:

  1. DKIM signs your outgoing emails.
  2. The recipient’s server verifies the DKIM signature.
  3. DMARC tells the recipient’s server what to do with emails that fail DKIM verification (quarantine, reject, or report).

By implementing both DKIM and DMARC, you can significantly improve email security, prevent spoofing attempts, and ensure your legitimate emails reach their intended recipients.

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