A DKIM record is a DNS entry that enables email authentication by adding a cryptographic signature to outgoing emails. This signature allows receiving mail servers to verify that an email was sent from an authorized source and that its content has not been altered in transit. DKIM is an essential component of deliverability, working alongside SPF and DMARC to prevent email phishing and spoofing attacks, and unauthorized email use.

By implementing DKIM, you enhance your domain’s reputation, build trust with email providers, and improve your email deliverability. Without DKIM, your emails are more likely to be flagged as spam or rejected altogether, leading to lower open rates and reduced engagement. Proper DKIM authentication ensures that your messages reach your recipients’ inboxes while protecting your brand’s integrity.

The Free DKIM Checker Tool helps you verify and analyze your DKIM record to ensure it is properly configured for secure email authentication. Simply enter your domain, and the tool retrieves the DKIM record from your DNS settings. It then checks whether the record is present, correctly formatted, and valid.

The tool also detects common misconfigurations, such as missing or incorrect public keys, formatting errors, or expired DKIM records. By using the DKIM Checker, you can quickly identify and fix issues that may be affecting your email deliverability and security. Regularly checking your DKIM record ensures that your email authentication remains effective, protecting your domain from spoofing and phishing threats.

Yes, the DKIM Checker Tool is completely free to use. You can verify your DKIM records, detect configuration issues, and ensure your email authentication is correctly set up without any cost.

Generating a DKIM record involves creating a cryptographic key pair - one private key used by your mail server to sign emails and one public key added to your domain’s DNS records for verification. Our DKIM Generator tool automates this process in just a few simple steps:

1. Enter Your Domain – Provide the domain you want to generate a DKIM record for.
2. Select A DKIM Selector – A selector is a unique identifier for the DKIM record, often provided by your email service provider.
3. Generate The DKIM Key Pair – The tool will generate a public and private key pair.
4. Add The DKIM Record To Your DNS – Copy the generated DKIM public key and add it as a TXT record in your domain’s DNS settings.
5. Test And Verify – Use a DKIM Checker to confirm that your DKIM record is correctly set up and working as expected.

Once implemented, DKIM will authenticate your outgoing emails, ensuring they pass security checks and reach recipients' inboxes securely.

The length of your DKIM directly impacts the security of your email authentication. The two most common DKIM lengths are 1024-bit and 2048-bit, each with its own advantages:

• 1024-bit DKIM is widely supported by all DNS providers and is sufficient for basic email authentication. However, it is considered less secure in the long term, as cryptographic advancements make it more vulnerable to potential attacks.
• 2048-bit DKIM provides stronger encryption and is recommended for improved security. It significantly reduces the risk of brute-force attacks and unauthorized tampering. Most modern email providers, including Google and Microsoft, support 2048-bit DKIM keys, making it the preferred choice for enhanced protection.

If your DNS provider supports 2048-bit keys, it is best to use them to future-proof your security. However, if compatibility issues arise, a 1024-bit key can still provide a reasonable level of protection.

Misconfigurations in DKIM records can lead to authentication failures, affecting your email deliverability and security. Here are some of the most common DKIM errors:

1. Missing DKIM Record – If your domain does not have a DKIM record in its DNS settings, receiving email servers cannot authenticate your messages, increasing the risk of spam filtering.
2. Incorrect DKIM Syntax – Formatting errors, such as missing semicolons, incorrect character encoding, or misplaced quotation marks, can make your DKIM record invalid.
3. Mismatched DKIM Selector – Some email providers use specific selectors for DKIM. If your email service provider’s selector does not match the one in your DNS, authentication will fail.
4. Expired Or Revoked DKIM Keys – DKIM should be rotated periodically to enhance security. Using an outdated or revoked key can lead to authentication failures.
5. Truncated DKIM Records – Some DNS providers have character limits that may cut off long DKIM records, making them incomplete. If your DKIM record is too long, consider using a shorter selector name or checking if your DNS provider supports splitting long TXT records.
6. DKIM Too Weak – Some email providers require a minimum DKIM length for security reasons. A 1024-bit key may not be accepted by all providers, so upgrading to a 2048-bit key is recommended.

To avoid these errors, always verify your DKIM record after setup using a DKIM Checker tool. Regular monitoring and periodic updates ensure your authentication remains effective and secure.

DKIM (DomainKeys Identified Mail) improves deliverability by authenticating your emails and building trust with email providers. When an email is sent, DKIM adds a special signature to the message header. This signature is verified by the recipient’s mail server using the public key published in your domain’s DNS. If the DKIM check passes, it confirms that the email was not tampered with and came from an authorized sender.

Email providers like Gmail, Outlook, and Yahoo prioritize authenticated emails when deciding whether to deliver them to the inbox or spam folder. A valid DKIM record helps prove that your emails are legitimate, reducing the risk of being marked as spam. Additionally, when DKIM is combined with SPF and DMARC, it strengthens your domain’s overall security and reputation. This results in higher inbox placement rates, increased open rates, and better engagement with your emails.

By using DKIM, you can ensure your messages are trusted by email providers, improve your sender reputation, and maximize your chances of reaching your recipients’ inboxes rather than being flagged as spam or rejected outright.

DKIM, SPF, and DMARC are three essential email authentication protocols that work together to improve deliverability.

• DKIM (DomainKeys Identified Mail) ensures that an email message has not been altered in transit and confirms that it was sent from an authorized source. It does this by adding an encrypted signature to the email header, which receiving mail servers can verify using the sender’s published DKIM record in DNS.
• SPF (Sender Policy Framework) specifies which mail servers are allowed to send emails on behalf of a domain. It helps prevent email spoofing by enabling receiving servers to check whether an incoming email is coming from an authorized server listed in the SPF record. However, SPF alone does not verify the integrity of the email content.
• DMARC (Domain-based Message Authentication, Reporting, and Conformance) builds upon DKIM and SPF by providing a policy framework that tells receiving mail servers how to handle emails that fail authentication checks. DMARC allows domain owners to enforce policies such as rejecting or quarantining unauthenticated emails and provides reporting on email activity to help monitor potential abuse or misconfigurations.

Together, these protocols work to prevent spoofing, phishing, and spam, ensuring emails from your domain are properly authenticated and reducing the likelihood of your messages being flagged as suspicious or fraudulent.

A DKIM selector is a unique identifier that is used to locate and retrieve the correct DKIM public key from a domain’s DNS records. When a sender configures DKIM, they specify a selector that is used in the DKIM-Signature header of outgoing emails. The recipient’s mail server then uses this selector to look up the corresponding DKIM record in DNS and verify the email’s authenticity.

Selectors matter because they allow multiple DKIM keys to exist under the same domain without conflicts. This is especially useful when a domain uses multiple email services (e.g., a marketing platform, a CRM, and a transactional email provider), each requiring its own DKIM key. By assigning different selectors to each service, organizations can manage DKIM keys independently and rotate them when needed without affecting other services.

For example, if an organization uses “marketing” as a selector for an email marketing tool and “sales” for a CRM, the respective DKIM records in DNS would look like:

• marketing._domainkey.example.com
• sales._domainkey.example.com

When choosing a DKIM selector, best practices include keeping it simple, descriptive, and unique for each email service. Properly managing DKIM selectors ensures seamless authentication and enhances overall email security.