Demystifying DKIM Records

Jun 12, 2023 | Blog, Deliverability, DKIM

Enhancing Email Security and Trust

In the realm of email security, protecting against phishing attacks and ensuring message integrity is crucial. DomainKeys Identified Mail (DKIM) offers a powerful solution by enabling domain owners to digitally sign their outgoing emails.

In this blog post, we will explore what DKIM records are, why they are essential, and how to implement them to bolster your email security.

Understanding DKIM Records

DKIM is an email authentication method that associates a digital signature with outgoing messages. This signature is generated using cryptographic keys, which are stored in DNS records known as DKIM records.

When an email is received, the recipient’s server can verify the authenticity of the message by checking its DKIM signature against the corresponding DKIM record.

Why Use DKIM Records?

  • Message Integrity: DKIM records protect against email tampering during transit. The digital signature verifies that the email content has not been modified since it left the sender’s domain, ensuring message integrity.
  • Sender Authentication: By signing outgoing emails, DKIM records authenticate the sending domain. This verification mechanism helps prevent email spoofing and strengthens the trustworthiness of your brand’s email communications.
  • Improved Email Deliverability: Many email service providers and receivers use DKIM as a factor in determining the legitimacy of incoming emails. Implementing DKIM records can improve your email deliverability rates by reducing the chances of your messages being marked as spam or rejected.

Implementing DKIM Records

Here’s a step-by-step guide to implementing DKIM records:

1. Generate DKIM Keys: Use a DKIM key generation tool or your email service provider’s interface to create a pair of cryptographic keys. These keys consist of a private key (kept secure on your server) and a public key (published in your DKIM record).

2. Create a DKIM TXT Record: Access your domain’s DNS management interface and create a TXT record containing the public key. This record typically follows the naming convention “_domainkey.yourdomain.com.”

3. Configure the DKIM Signing Process: Set up your email server or provider to sign outgoing emails with the private key associated with your DKIM record. Consult your provider’s documentation for specific instructions on enabling DKIM signing.

4. Publish the DKIM Record: Save the changes in your DNS management interface. The DKIM record will propagate across DNS servers, typically within a few hours, but it can take up to 48 hours to fully propagate.

Best Practices for DKIM Implementation

  • Rotate DKIM Keys: Regularly rotate your DKIM keys to maintain a strong security posture. This practice minimizes the impact of compromised keys and ensures ongoing protection for your email communications.
  • Monitor DKIM Authentication: Employ monitoring tools to track DKIM authentication status and receive alerts about any failed or missing signatures. Promptly investigate and resolve any issues to maintain optimal email deliverability.
  • Combine with SPF and DMARC: Maximize email security by implementing a comprehensive email authentication framework. Combine DKIM with Sender Policy Framework (SPF) and Domain-based Message Authentication, Reporting, and Conformance (DMARC) to reinforce sender authentication and protect against email fraud.
  • Unsure what your DKIM record currently is? You can either check your DNS settings directly, should you not have access to the DNS panel yourself you can use a tool like MX Toolbox


Implementing DKIM records is a vital step in safeguarding your email communications against forgery and tampering. By digitally signing your outgoing messages, you enhance sender authentication, message integrity, and deliverability.

Make DKIM a part of your email security strategy to build trust with recipients and protect your brand’s reputation in the digital realm.

Heysender blog

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