--- title: "How to find a DKIM selector for your domain? | DMARC Report" description: "A DKIM selector is a keyword, an ID, or a string that makes a DKIM key unique. It’s generated by appending the selector to your sending domain." image: "https://dmarcreport.com/og/blog/how-to-find-a-dkim-selector-for-your-domain.png" canonical: "https://dmarcreport.com/blog/how-to-find-a-dkim-selector-for-your-domain/" --- Quick Answer A DKIM selector is a keyword, an ID, or a string that makes a DKIM key unique. It’s generated by appending the selector to your sending domain. Let’s say your domain is company.com, and your selector is mail1; you create a DKIM key by appending it to a .\_domainkey. Share [ ](https://www.linkedin.com/sharing/share-offsite/?url=undefined%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F "Share on LinkedIn") [ ](https://twitter.com/intent/tweet?text=How%20to%20find%20a%20DKIM%20selector%20for%20your%20domain%3F&url=undefined%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F "Share on X/Twitter") [ ](https://www.facebook.com/sharer/sharer.php?u=undefined%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F "Share on Facebook") [ ](https://reddit.com/submit?url=undefined%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F&title=How%20to%20find%20a%20DKIM%20selector%20for%20your%20domain%3F "Share on Reddit") [ ](mailto:?subject=How%20to%20find%20a%20DKIM%20selector%20for%20your%20domain%3F&body=Check out this article: undefined%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F "Share via Email") ![DKIM selector](https://media.mailhop.org/dmarcreport/images/2025/01/dmarc-analyzer-3932.jpg) ## Try Our Free DKIM Lookup Auto-discover DKIM selectors for any domain - scan 185 common selectors across all major providers. [ Discover DKIM Selectors → ](/tools/dkim-lookup/) ![DKIM key](https://media.mailhop.org/dmarcreport/images/2025/01/dmarc-analyzer-3935-150x150.jpg) A [DKIM selector](/blog/using-dkim-selectors-to-enhance-control-over-email-authentication/) is a keyword, an ID, or a string that makes a **DKIM key unique**. It’s generated by appending the selector to your sending domain. Let’s say your domain is company.com, and your selector is mail1; you create a DKIM key by appending it to a .\_domainkey. Here’s what it would look like- **mail1.\_domainkey.company.com** Let’s see how you can find your DKIM selector. ## 2 ways to find your DKIM selector If you are struggling to find a DKIM selector for your domain, then here are two ways to do it- ### 1\. Finding the DKIM selector using a test mail By sending a test email to your inbox, you can confirm if your messages are **DKIM-signed**. This will also help you locate your DKIM selector. It’s a quick way to verify [DKIM authentication](/what-is-dkim/) is active on your domain. Here are the steps for Outlook as the inbox. These remain pretty much the same for other mailboxes, too. - Send a test email to your email address. - Open the received **email in Outlook**. - From the message details icon (ellipsis), go to ‘View’ and select ‘View Message Details’ from the [drop-down menu](https://www.computerhope.com/jargon/d/dropdm.htm). - Once the [email headers](https://proton.me/blog/what-are-email-headers) are visible, scroll down to locate the ‘DKIM-Signature’ section. Alternatively, press ‘**Ctrl + F**’ and search for ‘DKIM-Signature.’ - _In the second line of the ‘DKIM-Signature,’ find the tag ‘s=,’ which represents the associated selector. In this example, the DKIM selector is ‘s=k1.’_ ![email service](https://media.mailhop.org/dmarcreport/images/2025/01/dmarc-analyzer-3933.jpg) ### 2\. Finding the DKIM selector through the email service provider If you use a [third-party](https://www.investopedia.com/terms/t/third-party.asp) provider to send emails, your messages are typically **DKIM-signed by default**. _To confirm your emails are DKIM signed and identify the associated DKIM selector, follow these steps_. For this example, we used Mailgun: - Log in to your [Mailgun account](https://www.mailgun.com/). - Navigate to the ‘**Sending’ drop-down menu**. - _Select the ‘Domain Settings’ tab._ - Go to the ‘[DNS Records](https://www.cloudflare.com/learning/dns/dns-records/)’ category (it defaults to the Overview tab). - Locate your DKIM key in the ‘DKIM’ section. ## DKIM selector best practices Configuring the DKIM selector requires mindfulness and technical expertise. Considering these **best practices** will help- ### 1\. Configure unique selectors Avoid using easily guessable and **short selectors**, as [threat actors](https://www.nbcnews.com/tech/security/us-treasury-says-computers-hacked-chinese-threat-actor-rcna185809) can predict them. _Don’t use generic names like ‘default,’ ‘selector1,’ or ‘mail.’ Instead, use a combination of alphanumeric characters and random strings. For example, use ‘s=dkim2025xyz1’ rather than ‘s=default.’_ ### 2\. Use longer keys Choose DKIM keys that are at least [1024 bits long](https://usefoyer.com/how-big-is/1024-bits). 2048 and 4096 bits are better, as they offer **stronger security** against brute force and similar attacks. A longer key increases the time and computational power required for attackers to break it. ![DKIM keys regularly ](https://media.mailhop.org/dmarcreport/images/2025/01/create-dmarc-record-2.jpg) ### 3\. Rotate your DKIM keys and selectors regularly Periodically rotate your [DKIM keys](/blog/setting-dkim-keys-for-salesforce/) and selectors to reduce the risk of their compromise. Updating your selectors ensures that even if an older key is exposed, it will no longer pose a threat. Also, clearly document your selector naming practices to streamline the process of rotating and managing DKIM keys and selectors. This will also help you **prevent configuration issues** and confusion among team members. A [DKIM lookup](/tools/dkim-lookup/) after each rotation confirms the new key resolves in DNS before you retire the old selector. ## Final words It isn’t easy to manage [email authentication](/blog/why-email-authentication-matters-for-businesses/) protocols, but if you consistently follow best practices and document your changes, you’ll be good to go. For a refresher on how the standards fit together, see [SPF, DKIM, and DMARC explained](/blog/spf-vs-dkim-vs-dmarc-difference-explained-2026/). For [DKIM](/dmarc-fundamentals/what-is-dkim/), it’s important to use **unguessable selectors** and rotate them periodically. [Contact us](/contact/) or [DMARCReport](/) for expert consultation. ## Topics [ dkim ](/tags/dkim/)[ dkim selector ](/tags/dkim-selector/) ![Brad Slavin](https://media.mailhop.org/dmarcreport/images/team/brad-slavin.jpg) [ Brad Slavin ](/authors/brad-slavin/) General Manager Founder and General Manager of DuoCircle. Product strategy and commercial lead for DMARC Report's 2,000+ customer base. [LinkedIn Profile →](https://www.linkedin.com/in/bradslavin) ## Take control of your DMARC reports Turn raw XML into actionable dashboards. Start free - no credit card required. [Start Free Trial](https://app.dmarcreport.com/signup?plan=free) [Check Your DMARC Record](/tools/dmarc-checker/) Scan Your Domain Now Instantly scan your domain for DKIM, SPF, and DMARC issues Check My Domain Share this article [ ](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fdmarcreport.com%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F) [ ](https://twitter.com/intent/tweet?text=How%20to%20find%20a%20DKIM%20selector%20for%20your%20domain%3F&url=https%3A%2F%2Fdmarcreport.com%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F) [ ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fdmarcreport.com%2Fblog%2Fhow-to-find-a-dkim-selector-for-your-domain%2F) Copy Related Articles - [ ![How To Protect Your Domain From Phishing Using DMARC](https://media.mailhop.org/dmarcreport/images/2026/05/dmarc-record-generator-8634.jpg) How To Protect Your Domain From Phishing Using DMARC Uncategorized ](/blog/how-to-protect-your-domain-from-phishing-using-dmarc/) - [ ![Email Security](https://media.mailhop.org/dmarcreport/images/2023/01/dmarc-alignment-6822.jpg) Learn What SPF, DKIM, and DMARC are to Ensure Email Security for Your Domain in 2023 Uncategorized ](/blog/learn-what-spf-dkim-and-dmarc-are-to-ensure-email-security-for-your-domain-in-2023/) - [ ![email authentication](https://media.mailhop.org/dmarcreport/images/2024/09/dmarc-report-6784.jpg) Using DKIM selectors to enhance control over email authentication Uncategorized ](/blog/using-dkim-selectors-to-enhance-control-over-email-authentication/) - [ ![Email Security](https://media.mailhop.org/dmarcreport/images/2023/04/dmarc-analyzer-1686.jpg) Why is Email Security Important for Businesses Today? Uncategorized ](/blog/why-is-email-security-important-for-businesses-today-2/) ## Related Articles [ Uncategorized 11m How To Protect Your Domain From Phishing Using DMARC May 8, 2026 ](/blog/how-to-protect-your-domain-from-phishing-using-dmarc/)[ Uncategorized 6m Learn What SPF, DKIM, and DMARC are to Ensure Email Security for Your Domain in 2023 Jan 19, 2023 ](/blog/learn-what-spf-dkim-and-dmarc-are-to-ensure-email-security-for-your-domain-in-2023/)[ Uncategorized 3m Using DKIM selectors to enhance control over email authentication Sep 25, 2024 ](/blog/using-dkim-selectors-to-enhance-control-over-email-authentication/)[ Uncategorized 6m Why is Email Security Important for Businesses Today? 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