{"id":2374,"date":"2024-01-25T13:25:20","date_gmt":"2024-01-25T07:55:20","guid":{"rendered":"https:\/\/kdmarc.com\/blog\/?p=2374"},"modified":"2026-05-19T18:00:53","modified_gmt":"2026-05-19T12:30:53","slug":"dkim-key-rotation","status":"publish","type":"post","link":"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/","title":{"rendered":"DKIM Key Rotation: A Vital Security Measure"},"content":{"rendered":"\n<!-- Key Takeaways Section | Threatcop Brand Style -->\n\n<style>\n.threatcop-summary {\n    border: 1px solid #2f80ed;\n    background-color: #f2f7ff;\n    padding: 20px 24px;\n    border-radius: 6px;\n    margin: 30px 0;\n}\n.threatcop-summary h3 {\n    margin-top: 0;\n    color: #2f80ed;\n    font-size: 20px;\n}\n.threatcop-summary ul {\n    padding-left: 20px;\n    margin: 10px 0 0;\n}\n.threatcop-summary li {\n    margin-bottom: 8px;\n    line-height: 1.5;\n}\n<\/style>\n\n<div class=\"threatcop-summary\">\n    <h3><span class=\"ez-toc-section\" id=\"Key_Takeaways\"><\/span>Key Takeaways<span class=\"ez-toc-section-end\"><\/span><\/h3>\n    <ul>\n        <li>DKIM key rotation prevents attackers from abusing compromised or outdated email signing keys.<\/li>\n        <li>Regular rotation strengthens email authentication and improves domain trust.<\/li>\n        <li>Long-term static DKIM keys increase spoofing and phishing risks.<\/li>\n        <li>Organizations should maintain overlapping keys to avoid email delivery disruption during rotation.<\/li>\n        <li>Automated rotation policies and monitoring ensure continuous email security hygiene.<\/li>\n    <\/ul>\n<\/div>\n\n\n<p>\u00a0<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #414141;color:#414141\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #414141;color:#414141\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Key_Takeaways\" >Key Takeaways<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#What_is_DKIM_Key_Rotation\" >What is DKIM Key Rotation?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#How_Does_DKIM_Key_Rotation_Prevent_DKIM_Vulnerability\" >How Does DKIM Key Rotation Prevent DKIM Vulnerability?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Book_a_Free_Demo_Call_with_Our_People_Security_Expert\" >Book a Free Demo Call with Our People Security Expert<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Enter_your_details\" >Enter your details<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Methods_of_Key_Rotation\" >Methods of Key Rotation<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#CNAME\" >CNAME<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Subdomain_Delegation\" >Subdomain Delegation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Manual_Process_of_Rotation_Should_be_Avoided\" >Manual Process of Rotation Should be Avoided<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Automatic_DKIM_Key_Rotation\" >Automatic DKIM Key Rotation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#DKIM_Key_Rotation_Best_Practices\" >DKIM Key Rotation Best Practices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#How_Frequently_Should_You_Rotate_DKIM_Keys\" >How Frequently Should You Rotate DKIM Keys?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Timeflow_of_Key_Rotation\" >Timeflow of Key Rotation<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Proactive_Practices_to_Ensure_Email_Security\" >Proactive Practices to Ensure Email Security<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#FAQs\" >FAQs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#What_happens_if_you_never_rotate_DKIM_keys\" >What happens if you never rotate DKIM keys?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Does_rotating_DKIM_keys_affect_email_deliverability\" >Does rotating DKIM keys affect email deliverability?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#What_is_the_difference_between_a_DKIM_selector_and_a_DKIM_key\" >What is the difference between a DKIM selector and a DKIM key?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/#Can_DKIM_key_rotation_be_automated\" >Can DKIM key rotation be automated?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<p>\u00a0<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">With the mandate that came into effect from February 2024, there is a heightened focus on the need to rotate DKIM keys regularly. This directive, issued by leading technology and email service providers, aims to further bolster email security. Regular DKIM key rotation is now recognised as a crucial practice for maintaining the integrity and security of email communications. It prevents potential exploits of outdated or compromised keys and ensures continuous effectiveness in email authentication processes.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">This updated guideline is particularly pertinent for organisations managing substantial email traffic, as it plays a vital role in safeguarding against evolving email-based cyber threats. Adhering to this mandate not only enhances security measures but also sustains the trust and reliability of organisational email communication channels.<\/p>\n\n<style type=\"text\/css\">\n      @media print, screen and (max-width: 63.99875em){\n      .tnp-submit\n      width: 48%;\n      }\n      .wp-block-tnp-minimal{\n      padding: 20px;\n      }\n      .blog_para\n      margin-top: 4px !important;\n      line-height: 25px !important;\n      font-size: 15px !important;\n      }\n\n      }\n      .blog_para{\n      font-family: jost,sans-serif;\n      margin-top: 14px;\n      margin-bottom: 30px;\n      color: #fff;\n      font-size: 15px !important;\n      color: black !important;\n\n      }\n\n      .wp-block-tnp-minimal{\n      padding:20px;\n      border: 1px solid grey;\n      }\n\n      .tnp-submit a{\n        background: #1d58c7!important;\n    border-radius: 5px!important;\n    text-transform: inherit!important;\n    padding: 8px 25px!important;\n    font-weight: 600!important;\n    color: #fff!important;\n    width: 30%!important;\n    border: none;\n      }\n\n      .blog_get{\n      font-size: 24px !important;\n      font-weight: 700;\n      padding-bottom: 0px;\n    font-family: 'Poppins' !important;\n      margin-bottom: 0px;\n      margin-top: 0px;\n      margin-bottom: 0px !important;\n      color: white;\n          line-height: 30px;\n          color: white;\n      }\n      .row{\n             display: flex;\n    flex-wrap: wrap;\n    flex-direction: row;\n    padding: 25px 0px 25px 36px;\n    align-items: center;\n\n      }\n\n.colLeft{\n         flex-basis:50%;\n    -webkit-box-flex: 0;\n    flex-grow: 0;\n    max-width: 50%;\n    color: white;\n}\n    \n .colRight{\n       flex-basis: 45%;\n    -webkit-box-flex: 0;\n    flex-grow: 0;\n    max-width: 50%;\n }\n\n.tnp-subscription-minimal{\n    float: right;\n}\n<\/style>\n<div style=\"max-width: 741px; margin: 0 auto; background-image: url('https:\/\/awareness.threatcop.ai\/marketing\/linkedinlowerbanner.webp'); background-repeat: no-repeat; background-size: cover; background-position: center; \">\n<div class=\"row\">\n<div class=\"colLeft\">\n<p class=\"blog_get\" style=\"font-family: 'Poppins' !important; color: white !important\">Subscribe to Our Newsletter On Linkedin<\/p>\n<p class=\"blog_para\" style=\"font-size: 16px;font-family: 'Poppins' !important; color: white !important; margin-top: 10px; margin-bottom: 28px;line-height: 25px;\">Sign up to Stay Tuned with the Latest Cyber Security News and Updates<\/p>\n\n<div>\n<div class=\"tnp\" style=\"margin-bottom: 10px;\">\n            <form action=\"https:\/\/threatcop.com\/newsletter-thank-you\" method=\"get\" target=\"_blank\">\n<div class=\"tnp-submit\">\n                  <a class=\"libutton\" href=\"https:\/\/www.linkedin.com\/build-relation\/newsletter-follow?entityUrn=7062043746430783488\" target=\"_blank\" rel=\"noopener\">Subscribe<\/a><\/div>\n<\/form><\/div>\n<\/div>\n<\/div>\n<div class=\"colRight\">\n<div>\n<div class=\"tnp tnp-subscription-minimal \">\n            <img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/marketing\/newsletter-icon.webp\" class=\"img-fluid\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_DKIM_Key_Rotation\"><\/span><span style=\"color: #000000;\"><strong>What is DKIM Key Rotation?<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DKIM key rotation is the process of periodically changing DKIM keys. This action requires changing the entire DKIM key or a particular attribute of the DKIM key. This particular attribute is the \u2018p = tag\u2019, which signifies the public key. This public key is a combination of alphabets, numbers, and symbols which is recorded in DNS. Modifying the public key tag may also involve changing the key type.<br><br>DKIM stands for DomainKeys Identified Mail, whose primary purpose is to digitally sign the emails of a particular domain or email service provider.<\/p>\n\n\n<div class=\"wp-block-image wp-image-8730 size-full\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"608\" height=\"608\" src=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/blob1475497910148.png\" alt=\"what is DKIM key rotation\" class=\"wp-image-8730\"\/><figcaption class=\"wp-element-caption\"><span style=\"color: #000000;\">(Source: Duo Circle)<\/span><\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Does_DKIM_Key_Rotation_Prevent_DKIM_Vulnerability\"><\/span><strong><span style=\"color: #000000;\">How Does DKIM Key Rotation Prevent DKIM Vulnerability?<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When a network administrator of an organisation keeps the DKIM key unchanged for a long time, a threat actor who gets illegal access to the database can steal it. There is an additional security practice, called storage encryption, that prevents data theft. But if the cybercriminal somehow gains access to the DKIM key, it is just a matter of time before the entire email domain server is compromised. This element is referred to as &#8220;vulnerability&#8221; in DKIM.<\/p>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n    <meta charset=\"UTF-8\">\n    <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Document<\/title>\n<\/head>\n\n<style>\n    .interestedBtn {\n        width: 80% !important;\n        box-sizing: border-box !important;\n        display: inline-block !important;\n        padding: 11px !important;\n        border: 1px !important;\n        border-color: #ddd !important;\n        margin-top: 10px !important;\n        background-color: #183e8b !important;\n        background-image: none !important;\n        text-shadow: none !important;\n        color: #fff !important;\n        font-size: 14px !important;\n        line-height: 20px !important;\n        border-radius: 5px !important;\n        margin: 0 !important;\n        cursor: pointer !important;\n        box-shadow: 0px 4.66px 22.99px 0px rgba(0, 0, 0, 0.10);;\n    }\n\n\n        .formSec .formSecTwo{\n            padding-top: 15px !important;\n            margin-bottom: 30px !important;\n        }\n\n\n    .tnp-email {\n        width: 80% !important;\n        box-sizing: border-box;\n        padding: 8px 10px;\n        display: inline-block;\n        border: 1px solid #ced4da;\n        background: #fff;\n        color: #000 !important;\n        font-size: 13px;\n        line-height: 20px;\n        border-radius: 2px;\n        padding-right: 30px;\n        margin-bottom: 0px;\n    }\n\n    .formSec {\n        border: 1px solid #ced4da;\n        float: left !important;\n        width: 55% !important;\n    }\n\n    .mainBox {\n       \/* border: 1px solid #183e8b;*\/\n         background: white;\n        max-width: 600px !important;\n        margin: 0 auto !important;\n        padding: 20px !important;\n        font-family: Arial, Helvetica, sans-serif !important;\n    }\n\n    .boxDiv {\n        display: flex !important;\n    }\n\n    .boxConsult {\n        float: left !important;\n        width: 45% !important;\n        padding: 10px !important;\n    }\n\n    .formSecTwo {\n        text-align:center !important;\n        width: 100% !important;\n    }\n\n    .formHeading {\n        font-family: Arial, Helvetica, sans-serif;\n        margin-top: 0px;\n        font-weight: 700;\n        line-height: 25px;\n        font-size: 18px !important;\n        \n       margin-bottom: 60px !important;\n       color: #000!important;\n          margin-top: 5px !important;\n    }\n\n    .fieldHeading {\n        margin: 0 !important;\n        font-size: 13px !important;\n        text-align: left !important;\n        margin: 0px 39px 2px 93px !important;\n        font-weight: 500 !important;\n    }\n\n    .image {\n        max-width:90% !important;\n        height: auto !important;\n    }\n\n     .email-icon {\n            position: absolute;\n            right: 50px;\n             top: 20px;\n            transform: translateY(-50%);\n            pointer-events: none; \n        }\n\n          .email-container{\n             position: relative;\n         \n        }\n       \n\n        .email-icon img{\n                 width: 15px;\n        }\n\n\n         input::placeholder {\n            color:#495057;\n        }\n\n\n     ::placeholder {\n        color: #495057;\n    }\n\n        ::-ms-input-placeholder { \n          color:#495057;\n        }\n\n\n        input:-webkit-autofill {\n            background-color: transparent !important;\n            -webkit-box-shadow: 0 0 0px 1000px white inset !important; \n            box-shadow: 0 0 0px 1000px white inset !important;\n            color: #495057 !important; \n        }\n\n        \n        input {\n            color:#495057 !important;\n        }\n\n\n    @media screen and (max-width: 480px) {\n        .boxDiv {\n            display: block !important;\n            padding: 15px !important;\n         \n        }\n\n        .image{\n        width: 80% !important;\n         margin-bottom: 14px;\n        }\n        .fieldHeading {\n            text-align: left !important;\n            margin: unset !important;\n        }\n\n        .boxConsult {\n            width: unset !important;\n            float: none !important;\n        }\n\n        .mainBox {\n            border: unset !important;\n        }\n\n        .formSec {\n            float: unset !important;\n            width: 100% !important;\n        }\n\n        .formSecTwo {\n            text-align: center !important;\n        }\n\n        .tnp-email {\n            width: 90% !important;\n        }\n\n        .formHeading {\n            margin-bottom: unset !important;\n        }\n\n         .email-icon {\n            position: absolute;\n            right: 25px;\n            top: 58%;\n            transform: translateY(-50%);\n            pointer-events: none; \/* Make sure the icon doesn't block clicking on the input *\/\n        }\n       \n        .email-container{\n             position: relative;\n        }\n\n    }\n<\/style>\n\n<body>\n\n    <div class=\"mainBox\" box-sizing:=\"\" border-box;=\"\">\n\n        <div class=\"boxDiv\">\n\n            <div class=\"boxConsult\">\n                <div>\n                    <h3 class=\"formHeading\" style=\" font-size: 16px !important;\"><span class=\"ez-toc-section\" id=\"Book_a_Free_Demo_Call_with_Our_People_Security_Expert\"><\/span>\n                        Book a Free Demo Call with Our People Security Expert<span class=\"ez-toc-section-end\"><\/span><\/h3>\n                <\/div>\n                <img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/form.svg\" class=\"image\">\n            <\/div>\n\n            <div class=\"formSec\">\n                <div class=\" formSecTwo\">\n                    <h4 style=\"margin-top: 0; font-size: 16px !important;\"><span class=\"ez-toc-section\" id=\"Enter_your_details\"><\/span>Enter your details<span class=\"ez-toc-section-end\"><\/span><\/h4>\n                    <div class=\"tnp tnp-subscription-minimal\">\n                        <form action=\"https:\/\/threatcop.com\/thankyou-blog\" method=\"get\" target=\"_blank\">\n                            <div class=\"email-container\" style=\"margin-bottom:20px;\">\n\n                                <input class=\"tnp-email\" type=\"text\" required=\"\" name=\"FullName\" value=\"\"\n                                    placeholder=\"Full Name\">\n                                    <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon01.svg\" class=\"img-fluid\" \/><\/span>\n                            <\/div>\n\n                            <div class=\"email-container\" style=\"margin-bottom:20px;\">\n                               \n                                <input class=\"tnp-email\" type=\"email\" required=\"\" name=\"email\" value=\"\"\n                                    placeholder=\"Corporate Email Id\">\n                                     <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon02.svg\" class=\"img-fluid\" \/><\/span>\n                            <\/div>\n\n                            <div class=\"email-container\" style=\"margin-bottom:20px;\">\n                               \n                                <input class=\"tnp-email\" type=\"text\" required=\"\" name=\"CompanyName\" value=\"\"\n                                    placeholder=\"Company Name\">\n                                    <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon03.svg\" class=\"img-fluid\" \/><\/span>\n\n                            <\/div>\n\n                            <div class=\"email-container\">\n                               \n                                <input class=\"tnp-email\" type=\"number\" required=\"\" name=\"Phone\" value=\"\"\n                                    placeholder=\"Phone No.\"><br>\n                                    <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon04.svg\" class=\"img-fluid\" \/><\/span>\n                            <\/div>\n                            <input type=\"hidden\" name=\"BlogForm\" value=\"BlogForm\"><br>\n                            <input class=\"tnp-submit interestedBtn\" name=\"submit\" type=\"submit\"\n                                value=\"SUBMIT\">\n\n                        <\/form>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n        <\/div>\n    <\/div>\n\n<\/body>\n\n<\/html>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">As a resolution measure, an\u00a0<strong>organisation must rotate DKIM keys to ensure its domain is not vulnerable<\/strong>.<\/span><span style=\"color: #000000;\"><span style=\"font-weight: 400;\"> <\/span><\/span><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">Additionally, it ensures signatures are updated,\u00a0<a href=\"https:\/\/threatcop.com\/blog\/increase-domain-reputation-and-email-deliverability\/\" target=\"_blank\"><strong><span style=\"color:#183994\">enhancing email deliverability<\/span><\/strong><\/a><\/span><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">.<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It is extremely important to rotate DKIM keys, as this is the first step in mitigating DNS-related risks. It incorporates best practices in cybersecurity awareness and implementation, primarily focused on enhancing email security and defending the domain servers against attacks.<br><br>Regular DKIM key rotation can reduce the risk of compromise of active public keys. The threat actors can get access to the keys during a data breach. Rotating DKIM keys will eradicate the possibility of stolen keys being used by cyber attackers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">There are multiple aspects and methods of rotating DKIM keys. So, there are primarily two aspects &#8211; automated and manual. The purpose of DKIM is to ensure that each email&#8217;s private key is properly paired with the domain&#8217;s public key.<\/span> So, setting the DKIM key is the most important element,<span style=\"font-weight: 400; color: #000000;\"> and it must be done carefully. Read more about how to <span style=\"color: #183994;\"><strong><a style=\"color: #183994;\" href=\"https:\/\/threatcop.com\/blog\/configure-dkim\/\" rel=\"noopener noreferrer\">configure DKIM<\/a><\/strong><\/span> using best practices to avoid any mistakes.\u00a0<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Methods_of_Key_Rotation\"><\/span><span style=\"color: #000000;\"><b>Methods of Key Rotation<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The process of key rotation involves assigning public keys to the DNS records of a particular domain. This public key is paired with a private key specific to the sender&#8217;s email address. This is commonly known as digitally signing the emails and the email service provider.<br><br>The simplest method of key rotation is manual, where a user changes the public key and then pastes it into the DNS. There are some disadvantages to this method, which are discussed in the next section.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"CNAME\"><\/span><span style=\"color: #000000;\"><b>CNAME<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CNAME refers to a canonical name that is stored in the form of a record, where one domain is mapped to another. Sometimes an organisation&#8217;s administrator delegates a vendor to use CNAME. The CNAMEs are under the control of a particular vendor. It means that if domain owners need to revoke an authorisation, they simply remove the CNAME record.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The main disadvantage of using CNAME-based delegation is the possibility of allocating multiple DKIM keys, each based on a particular CNAME. The vendor is responsible for rotating DKIM keys via that CNAME. When configured, the vendor has the authority to rotate keys without even notifying the domain owner. This becomes disadvantageous and, in some cases, problematic for email domain owners.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Subdomain_Delegation\"><\/span><span style=\"color: #000000;\"><b>Subdomain Delegation<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">Subdomain delegation is the <\/span><b>simplest method for organisations to handle DKIM key rotation<\/b><span style=\"font-weight: 400;\">. In this method, an external vendor is hired to <\/span><\/span><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">manage\u00a0DKIM keys<\/span>. The domain owners do not handle DKIM themselves; instead, they assign a dedicated subdomain that sends emails on <span style=\"color: #000000;\"><span style=\"font-weight: 400;\">behalf of the domain.<\/span><\/span><\/p>\n\n\n<div class=\"wp-block-image wp-image-8731 size-full\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1680\" height=\"1304\" src=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/email-dkim-1.png\" alt=\"Subdomain Delegation\" class=\"wp-image-8731\"\/><figcaption class=\"wp-element-caption\"><span style=\"color: #000000;\">(Source: Osaka)<\/span><\/figcaption><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">The vendor assigned by the domain owners also handles DKIM key rotation. The domain owner can regain control of the administration at any time, and the vendor will no longer be allowed to manage DKIM.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Manual_Process_of_Rotation_Should_be_Avoided\"><\/span><span style=\"color: #000000;\">Manual Process of Rotation Should be Avoided<\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The process of manually generating a key requires a tool, and the key is then copied and pasted into the DNS. There is a possibility of mishandling or error. That is why the manual process is disregarded for setting DKIM or, specifically, key pairs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Automatic_DKIM_Key_Rotation\"><\/span><span style=\"color: #000000;\"><b>Automatic DKIM Key Rotation<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The email service provider can offer automatic DKIM key rotation, saving additional time troubleshooting and fixing errors. Some email marketing companies offer email security services. This is the recommended approach if your provider supports it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DKIM_Key_Rotation_Best_Practices\"><\/span><span style=\"color: #000000;\"><b>DKIM Key Rotation Best Practices<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The DKIM key rotation process is highly beneficial, but domain owners must follow certain practices to ensure it is carried out efficiently. Following these DKIM key rotation best practices will keep your domain protected and your email deliverability intact.<\/span><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><span style=\"color: #000000;\"><b>Length of Key: <\/b>Use at least a 2048-bit public key. A shorter key is more vulnerable and no longer meets the current sender requirements from Google and Yahoo.<\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\"><b>Expiration Time:<\/b><span style=\"font-weight: 400;\"> Every DKIM signature must have an expiration time that is greater than the rotation time.<\/span><\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\"><b>Rotation Frequency:<\/b><span style=\"font-weight: 400;\"> DKIM keys should be rotated within a year, in general. Additionally, given the risks involved and the organisation&#8217;s feasibility, its frequency should increase.\u00a0<\/span><\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\"><b>Test<\/b><span style=\"font-weight: 400;\">: For a shorter period, <\/span><\/span><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">use the \u201c<em><strong>t=y<\/strong><\/em>\u201d tag pair to test emails with DKIM signatures<\/span><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">.\u00a0<\/span><\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\"><b>Monitoring<\/b><span style=\"font-weight: 400;\">: In addition to DKIM, DMARC policy should be implemented to verify whether emails are signed. For that, the DMARC policy should be set to \u201c<\/span><b><i>p=none<\/i><\/b><span style=\"font-weight: 400;\">\u201d.<\/span><\/span><\/li>\n\n\n\n<li><strong>Keep the old key live for 48 hours:<\/strong> Emails already in transit still validate against the old key. Removing it too early causes authentication failures.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Frequently_Should_You_Rotate_DKIM_Keys\"><\/span><span style=\"color: #000000;\"><b>How Frequently Should You Rotate DKIM Keys?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The frequency of DKIM key rotation depends on the size of the business. Every business has its own risk level, which determines how it manages its network and domain security.<br><br>It is generally advised to rotate DKIM keys three to four times a year. A higher frequency is also an option. For financial and banking institutions, DKIM key rotation should be performed monthly.<br><br>The notion of frequency is also dependent on the complexities of the email programs or servers. Some financial institutions can also choose to decrease the frequency of DKIM key rotation due to the complexity of their domain servers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Timeflow_of_Key_Rotation\"><\/span><span style=\"color: #000000;\"><b>Timeflow of Key Rotation<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">There are <strong>two formats of the public key:<\/strong><\/span> 1024-bit and 2048-bit. Initially, a domain is assigned a public key with at least 1024 bits. Then, a selector is used to identify the key,<span style=\"font-weight: 400; color: #000000;\"> and two separate public-private key pairs are defined. The two public parts of the pairs (namely, Public Key1 and Public Key2) are updated in the DNS.\u00a0<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">After initially implementing DKIM, the emails are signed using private key 1. After a certain period (typically 3 or 4 months, depending on the organisation&#8217;s policy), key rotation occurs<\/span>. First, another public key (Public Key3) is generated <span style=\"font-weight: 400; color: #000000;\">and stored in DNS. Then, all the emails are signed with private key 2.\u00a0<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">Similarly, generalising<\/span> the above process to the nth key. Let\u2019s say, at the time of key rotation, a key pair is generated of at least 1024 bits for the nth designation. A public key of Key(n) is stored at the <span style=\"font-weight: 400; color: #000000;\">DNS. At this point, all the emails are signed using a private key of (n-1)th designation. Then, the public key of the (n-3)th designation is discarded from the DNS, and the public-private key pair (n-2) will be valid for older emails. This rotation process repeats for every n = n + 1.\u00a0<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><i><span style=\"font-weight: 400;\">For more clarification, consider the following image.<\/span><\/i><\/span><\/p>\n\n\n<div class=\"wp-block-image size-full wp-image-7916\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1602\" height=\"2023\" src=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100.jpg\" alt=\"DKIM Key Rotation\" class=\"wp-image-7916\" srcset=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100.jpg 1602w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100-238x300.jpg 238w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100-811x1024.jpg 811w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100-768x970.jpg 768w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100-1216x1536.jpg 1216w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100-80x101.jpg 80w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100-396x500.jpg 396w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/02\/Timeflow-DKIM-Key-Rotation@2x-100-634x800.jpg 634w\" sizes=\"auto, (max-width: 1602px) 100vw, 1602px\" \/><figcaption class=\"wp-element-caption\"><span style=\"color: #000000;\">(Source: M3AAWG)<\/span><\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Proactive_Practices_to_Ensure_Email_Security\"><\/span><span style=\"color: #000000;\"><b>Proactive Practices to Ensure Email Security<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DKIM is an essential email authentication protocol that works alongside SPF to enhance email domain security. DMARC is an authentication standard that helps implement policies to support both SPF and DKIM. Together, these three protocols form the foundation of a secure email domain.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Managing all three manually is time-consuming and error-prone. That is where TDMARC by Threatcop comes in. <a href=\"https:\/\/threatcop.com\/tdmarc\">TDMARC<\/a> is a dedicated tool that helps domain owners monitor SPF, DKIM, and DMARC configuration from a single dashboard. It flags misconfigurations before they affect deliverability and continuously verifies the validity of your DKIM records.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With TDMARC, you can also automate DKIM key rotation so keys are updated on schedule without manual intervention. No missed rotations, no copy-paste errors, no gaps in your email authentication coverage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you manage email at scale, TDMARC removes the guesswork from email security entirely.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><strong>FAQs<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<style>#sp-ea-14536 .spcollapsing { height: 0; overflow: hidden; transition-property: height;transition-duration: 300ms;}#sp-ea-14536.sp-easy-accordion>.sp-ea-single {margin-bottom: 10px; border: 1px solid #e2e2e2; }#sp-ea-14536.sp-easy-accordion>.sp-ea-single>.ea-header a {color: #444;}#sp-ea-14536.sp-easy-accordion>.sp-ea-single>.sp-collapse>.ea-body {background: #fff; color: #444;}#sp-ea-14536.sp-easy-accordion>.sp-ea-single {background: #eee;}#sp-ea-14536.sp-easy-accordion>.sp-ea-single>.ea-header a .ea-expand-icon { float: left; color: #444;font-size: 16px;}<\/style><div id=\"sp_easy_accordion-1779193434\"><div id=\"sp-ea-14536\" class=\"sp-ea-one sp-easy-accordion\" data-ea-active=\"ea-click\" data-ea-mode=\"vertical\" data-preloader=\"\" data-scroll-active-item=\"\" data-offset-to-scroll=\"0\"><div class=\"ea-card ea-expand sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"What_happens_if_you_never_rotate_DKIM_keys\"><\/span><a class=\"collapsed\" id=\"ea-header-145360\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145360\" aria-controls=\"collapse145360\" href=\"#\" aria-expanded=\"true\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-minus\"><\/i> What happens if you never rotate DKIM keys?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse collapsed show\" id=\"collapse145360\" data-parent=\"#sp-ea-14536\" role=\"region\" aria-labelledby=\"ea-header-145360\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">If a threat actor gets access to your private key through a data breach, they can send spoofed emails that pass DKIM authentication indefinitely. Without DKIM key rotation, there is no mechanism to invalidate a stolen key. This puts your domain reputation and recipients at risk.<\/span><\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"Does_rotating_DKIM_keys_affect_email_deliverability\"><\/span><a class=\"collapsed\" id=\"ea-header-145361\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145361\" aria-controls=\"collapse145361\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Does rotating DKIM keys affect email deliverability?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse145361\" data-parent=\"#sp-ea-14536\" role=\"region\" aria-labelledby=\"ea-header-145361\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">If done properly, DKIM key rotation does not affect deliverability. Problems only occur if the old key is removed too soon or the new public key has a typo. Follow the step-by-step process and test before making the switch.<\/span><\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"What_is_the_difference_between_a_DKIM_selector_and_a_DKIM_key\"><\/span><a class=\"collapsed\" id=\"ea-header-145362\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145362\" aria-controls=\"collapse145362\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> What is the difference between a DKIM selector and a DKIM key?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse145362\" data-parent=\"#sp-ea-14536\" role=\"region\" aria-labelledby=\"ea-header-145362\"> <div class=\"ea-body\"><p><span style=\"color: #000000\">A selector is a label in the DNS record name that tells mail servers which key to look up. A key is the actual cryptographic value in that record. One domain can have multiple selectors pointing to different keys. This is how you rotate DKIM keys without causing downtime.<\/span><\/p><\/div><\/div><\/div><div class=\"ea-card sp-ea-single\"><h3 class=\"ea-header\"><span class=\"ez-toc-section\" id=\"Can_DKIM_key_rotation_be_automated\"><\/span><a class=\"collapsed\" id=\"ea-header-145363\" role=\"button\" data-sptoggle=\"spcollapse\" data-sptarget=\"#collapse145363\" aria-controls=\"collapse145363\" href=\"#\" aria-expanded=\"false\" tabindex=\"0\"><i aria-hidden=\"true\" role=\"presentation\" class=\"ea-expand-icon eap-icon-ea-expand-plus\"><\/i> Can DKIM key rotation be automated?<\/a><span class=\"ez-toc-section-end\"><\/span><\/h3><div class=\"sp-collapse spcollapse \" id=\"collapse145363\" data-parent=\"#sp-ea-14536\" role=\"region\" aria-labelledby=\"ea-header-145363\"> <div class=\"ea-body\"><p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><span style=\"color: #000000\">Yes. Most enterprise email platforms and DMARC management tools support automated DKIM key rotation. Automation removes the risk of missed rotations and eliminates human error entirely.<\/span><\/p><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways DKIM key rotation prevents attackers from abusing compromised or outdated email signing keys. Regular rotation strengthens email authentication and improves domain trust. Long-term static DKIM keys increase spoofing and phishing risks. Organizations should maintain overlapping keys to avoid email delivery disruption during rotation. Automated rotation policies and monitoring ensure continuous email security hygiene. [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":7222,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-2374","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dmarc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Rotate DKIM Keys: Guide, Methods &amp; Best Practices<\/title>\n<meta name=\"description\" content=\"Learn how to rotate DKIM keys step by step, the best methods for DKIM key rotation, and best practices to protect your email domain from compromise.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/threatcop.com\/blog\/dkim-key-rotation\/\" \/>\n<meta property=\"og:locale\" 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