{"id":21695,"date":"2026-02-13T16:24:11","date_gmt":"2026-02-13T16:24:11","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/entender-dkim-como-funciona\/"},"modified":"2026-09-15T13:58:36","modified_gmt":"2026-09-15T13:58:36","slug":"entender-dkim-como-funciona","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/entender-dkim-como-funciona\/","title":{"rendered":"\u00bfQu\u00e9 es DKIM? Autenticaci\u00f3n de emails explicada (con gu\u00eda de configuraci\u00f3n)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Are you who you say you are, <a href=\"https:\/\/www.mailgun.com\/es\/resources\/podcasts\/spoofing-phishing-dmarcian\/\" target=\"_tabs\" rel=\"noopener noreferrer\">or are you a spoofer in disguise<\/a>? Answering this question is what DKIM is all about.<\/p>\n\n<p class=\"wp-block-paragraph\">As email usage and capabilities continue to grow, it\u2019s important to make sure that your sender reputation is staying positive and secure. One of the best ways to do this is to <b>use DKIM (DomainKeys Identified Mail)<\/b>. If the idea of yet another email acronym is throwing you off, don\u2019t be alarmed.<\/p>\n\n<p class=\"wp-block-paragraph\">We&#8217;re here to break this authentication down and walk you through the basics and benefits of DKIM.<\/p>\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-2449\"><p class=\"h5 m-0\" id=\"toc-title-2449\">\u00cdndice<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-is-dkim\">What is DKIM?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-does-dkim-work\">How does DKIM work?<\/a><a class=\"scrollme link-body-color\" href=\"#what-is-a-dkim-signature\">What is a DKIM signature?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-to-keep-your-dkim-keys-secure\">How to keep your DKIM keys secure<\/a><a class=\"scrollme link-body-color\" href=\"#what-is-a-dkim-record\">What is a DKIM record?<\/a><a class=\"scrollme link-body-color\" href=\"#what-are-dkim-record-checks\">What are DKIM record checks?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">04<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#why-is-dkim-important\">Why is DKIM important?<\/a><a class=\"scrollme link-body-color\" href=\"#what-are-the-benefits-of-dkim\">What are the benefits of DKIM?<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">05<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#how-to-set-up-dkim-with-mailgun\">How to set up DKIM with Mailgun<\/a><a class=\"scrollme link-body-color\" href=\"#verify-your-domain\">Verify your domain<\/a><a class=\"scrollme link-body-color\" href=\"#add-your-records\">Add your records<\/a><a class=\"scrollme link-body-color\" href=\"#common-dns-provider-documentation\">Common DNS Provider Documentation<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">06<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#what-you-need-to-remember-about-dkim-and-its-usage\">What you need to remember about DKIM and its usage<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">07<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#leveraging-other-email-authentications\">Leveraging other email authentications<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">08<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#faq\">FAQ<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What is DKIM?<\/h2>\n\n<p class=\"wp-block-paragraph\"><b>DKIM (DomainKeys Identified Mail) is an <\/b><a href=\"https:\/\/www.mailgun.com\/es\/blog\/email-authentication-your-id-card-sending\/\" target=\"_tabs\" rel=\"noopener noreferrer\"><b>email authentication<\/b><\/a><b> protocol that validates you as the true sender of a message using encrypted signatures. <\/b>It ensures that nobody has used your domain or other identifiers to impersonate you or your company.<\/p>\n\n<p class=\"wp-block-paragraph\">DKIM has become an authentication standard in the email world necessary for both bulk marketing and <a href=\"https:\/\/www.mailgun.com\/es\/soluciones\/plataforma-de-email-transaccional\/\" target=\"_tabs\" rel=\"noopener noreferrer\">transactional campaigns<\/a>. A message sent without DKIM and\/or SPF can be considered suspicious by different email analysis tools.<\/p>\n\n<h2 class=\"wp-block-heading\">How does DKIM work?<\/h2>\n\n<p class=\"wp-block-paragraph\">DKIM is a crucial component in safeguarding email security against phishing attacks. Employing domain-based message authentication,<b> DKIM verifies the authenticity of emails by attaching a digital signature linked to the sending domain name.<\/b> This signature acts as a stamp of legitimacy, ensuring that emails haven&#8217;t been tampered with during transit and originate from authorized sources. By providing a mechanism to detect and prevent email spoofing, DKIM adds a layer of trust to online communications, crucial in an age where phishing attacks are rampant.<\/p>\n\n<p class=\"wp-block-paragraph\">DKIM operates through a key pair system, where a private key is held by the email server and a corresponding public key is published in the DKIM signing domain&#8217;s DNS records. To implement DKIM effectively, email servers need to be configured to sign outgoing emails with this private key.<\/p>\n\n<p class=\"wp-block-paragraph\">This signing process embeds a cryptographic signature within the email header, serving as a digital fingerprint of authenticity. The DKIM signature is then verified by recipient servers against the public key stored in the DNS records of the sender&#8217;s domain. This conformance ensures that emails are from the claimed sender and haven&#8217;t been modified in transit. This also helps with email security. <b>Matching keys open the door to deliverability. Mismatched keys trigger alarms and land you in spam.<\/b><\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4413\" width=\"1261\" height=\"843\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/8vkh5n9H27FlWB__1_.png\" alt=\"Image shows DKIM signature sent to the receiving mail server which validates it against the public DKIM key and sends it to the inbox or to spam if the keys do not match.\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/8vkh5n9H27FlWB__1_.png 1261w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/8vkh5n9H27FlWB__1_-300x201.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/8vkh5n9H27FlWB__1_-768x513.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/8vkh5n9H27FlWB__1_-1024x685.png 1024w\" sizes=\"(max-width: 1261px) 100vw, 1261px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">There are a few important elements in DKIM authentication, including DKIM signatures and DKIM records. Let\u2019s see what they are and what role they play in this process.<\/p>\n\n<h3 class=\"wp-block-heading\">What is a DKIM signature?<\/h3>\n\n<p class=\"wp-block-paragraph\">The main component of DKIM is the <b>DKIM signature<\/b>, a header that is attached to your email messages which your recipient can use for verification. How you generate DKIM keys varies depending on your provider but some basic recurring variables of the signature are: <\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>\u201cd=\u201d refers to the signing domain<\/b> associated with a selector record to locate a public key. Messages from Mailgun are identified as \u201cd=mailgun.com\u201d.<\/li>\n\n\n\n<li><b>\u201cb=\u201d refers to the message\u2019s unique DKIM signature<\/b> of headers and body, encoded with Base64.<\/li>\n\n\n\n<li><b>\u201cbh\u201d refers to a digital hash value<\/b> that contains your encrypted private key (canonicalized by Base64) so it can be verified by the recipient.<\/li>\n<\/ul>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4414\" width=\"1190\" height=\"594\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-02.png\" alt=\"Image shows a cURL example of a DKIM signature with examples of the variables from the previous list.\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-02.png 1190w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-02-300x150.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-02-768x383.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Mailgun-API-02-1024x511.png 1024w\" sizes=\"(max-width: 1190px) 100vw, 1190px\" \/><\/figure>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>Did you know?<\/b> <a href='https:\/\/www.base64decode.org\/'>Base64<\/a> is used to safely carry data that has been encrypted, or stored, in a binary format over channels that usually only support text, like HTML and CSS.<\/div>\r\n    <\/div>\r\n\n<p class=\"wp-block-paragraph\">Just like with adding your John Hancock to a document, <b>your DKIM signature should be the last thing added to an out bounding message<\/b>. Why? Modifications to an email\u2019s content or its headers will alter its cryptographic hash (encoded information about the email content sent along with your encrypted key). Once sent, your DKIM signature \u2013 containing your encrypted private key\u2013 is validated by the recipient server.<\/p>\n\n<h2 class=\"wp-block-heading\">How to keep your DKIM keys secure<\/h2>\n\n<p class=\"wp-block-paragraph\">Using public-key cryptography, fortifies email security by allowing email servers to sign messages with a private key and attach a signature header. To enhance security, it\u2019s a good idea to use key rotation to periodically create new key pairs. Rotating keys mitigates the risk of compromised keys and ensures continued defense against potential attacks.<\/p>\n\n<h3 class=\"wp-block-heading\">What is a DKIM record?<\/h3>\n\n<p class=\"wp-block-paragraph\">A <b>DKIM record is part of your <\/b><a href=\"https:\/\/my.bluehost.com\/hosting\/help\/what-are-dns-records\" target=\"_tabs\" rel=\"noopener noreferrer\"><b>DNS records<\/b><\/a><b>. Its purpose is to store the public domain key(s) \u2013 string of randomly generated characters \u2013 you use for DKIM.<\/b> A simplified way of looking at it is to say that a DNS record is a listing of a domain and its IP address, and the DKIM record is a TXT record within the DNS record that contains a key used for email authentication.<\/p>\n\n<p class=\"wp-block-paragraph\">If you don\u2019t set up a DKIM record with your personal domain information, some email providers, like Google Mail, use their own default DKIM in your messages. However, <b>it is always best to create your own specific DKIM records.<\/b> Specific, endorsed records make verification and troubleshooting easier for both sender and recipient.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> <b>Need to set up multiple keys for your domain?<\/b> Use a DKIM selector to set up multiple delivery services from a domain, or to <a href='https:\/\/www.mailgun.com\/es\/blog\/email\/los-conceptos-basicos-de-los-subdominios-de-email\/'>send from a subdomain<\/a>.<\/div>\r\n    <\/div>\r\n\n<h3 class=\"wp-block-heading\">What are DKIM record checks?<\/h3>\n\n<p class=\"wp-block-paragraph\">A <b>DKIM record check<\/b> is pretty much what it sounds like \u2013 it means that you\u2019re <b>validating DKIM records to ensure they\u2019re correct.<\/b> DKIM record checks are particularly useful if you\u2019re <a href=\"text=We%20recommend%20using%20API%20for,and%20more%20flexible%20than%20SMTP.\" target=\"_tabs\" rel=\"noopener noreferrer\">sending emails via SMTP<\/a>. SMTP protocols don\u2019t automatically include these layers of authentication, making them more vulnerable to spam and email-based hacks than sending via API.<\/p>\n\n<p class=\"wp-block-paragraph\">DKIM record checks show the domain used to sign the DKIM signature, and validate that the email was authorized by the domain owner. Curious how to verify a record? Try it out with this handy <a href=\"https:\/\/www.dmarcanalyzer.com\/dkim\/dkim-checker\/\" target=\"_tabs\" rel=\"noopener noreferrer\">DKIM checker tool<\/a>.<\/p>\n\n<h2 class=\"wp-block-heading\">Why is DKIM important?<\/h2>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/autenticacion-emails-documento-identidad-envios\/\" target=\"_tabs\" rel=\"noopener noreferrer\"><b>DKIM provides protection<\/b><\/a> for the reputation of your organization and the integrity of its email program. It <b>offers domain protection against phishing and \u201cspoofing\u201d scams<\/b>, especially when used with <a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/implementar-dmarc\/\" target=\"_tabs\" rel=\"noopener noreferrer\">DMARC<\/a> and <a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/spf-records-basics\/\" target=\"_tabs\" rel=\"noopener noreferrer\">SPF<\/a>. DKIM is difficult to spoof since it detects inconsistencies in email headers and other unauthorized changes.<\/p>\n\n<h3 class=\"wp-block-heading\">What are the benefits of DKIM?<\/h3>\n\n<p class=\"wp-block-paragraph\"><b>Additionally, DKIM boosts your reputation. Because your messages can be verified, they are more likely to be trusted and recognized.<\/b> Knowing that your emails are secure helps recipients feel more comfortable when they\u2019re in contact with you. This can lead to more two-way communication between you and your email list, and help strengthen relationships with your customers.<\/p>\n\n<p class=\"wp-block-paragraph\"><b>DKIM helps ensure deliverability.<\/b> Without a DKIM signature and valid records, recipients\u2019 SMTP servers are significantly more likely to block your emails and mark them as spam . Remember we said that SMTP doesn\u2019t have built-in layers of authentication? Well, if you provide it you\u2019re that much more likely to land in the inbox.<\/p>\n\n<h2 class=\"wp-block-heading\">How to set up DKIM with Mailgun<\/h2>\n\n<p class=\"wp-block-paragraph\"><b>Mailgun requires a verified DKIM key via DNS check before a domain can send from its platform.<\/b> Keep your messages as secure as possible by customizing your key. Instead of using a provider\u2019s standard DKIM, you\u2019re prompted to set up verification details that are specific to your domain and are associated with your organization. This keeps your emails easily identifiable by recipients\u2014and it keeps your DKIM records recognizable and changeable for you and your team.<\/p>\n\n<p class=\"wp-block-paragraph\">Below is a step-by-step guide on how to customize your DKIM with Mailgun.<\/p>\n\n<h3 class=\"wp-block-heading\">Verify your domain<\/h3>\n\n<p class=\"wp-block-paragraph\">Add a domain you own and verify it by setting up the DNS record we provide (this is the DKIM record) at your DNS provider. An example is below.<\/p>\n\n<p class=\"wp-block-paragraph\">1. <b>Add your domain or subdomain<\/b> in the Domains tab of the Mailgun control panel, <a href=\"https:\/\/documentation.mailgun.com\/docs\/inboxready\/domains-ir\/#add-domain\" target=\"_tabs\" rel=\"noopener noreferrer\">or via the API<\/a>.<\/p>\n\n<p class=\"wp-block-paragraph\">2. <b>Choose your DKIM key length.<\/b> Longer keys equal more protection from spammers.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4189\" width=\"2560\" height=\"1189\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.16.40_PM-scaled.png\" alt=\"Mailgun verify domain dashboard\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.16.40_PM-scaled.png 2560w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.16.40_PM-1536x714.png 1536w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.16.40_PM-300x139.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.16.40_PM-768x357.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.16.40_PM-1024x476.png 1024w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.16.40_PM-2048x951.png 2048w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/figure>\n\n<h3 class=\"wp-block-heading\">Add your records<\/h3>\n\n<p class=\"wp-block-paragraph\">3. Open your <b>DNS provider and add the DKIM TXT DNS record provided<\/b>. This record can be found in the <b>Domain Verification &amp; DNS section of the domain settings page of the Mailgun control panel.<\/b><\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4197\" width=\"2560\" height=\"1051\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.22.49_PM-scaled.png\" alt=\"Mailgun DNS records dashboard\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.22.49_PM-scaled.png 2560w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.22.49_PM-1536x630.png 1536w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.22.49_PM-300x123.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.22.49_PM-768x315.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.22.49_PM-1024x420.png 1024w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.22.49_PM-2048x841.png 2048w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">4. If you want Mailgun to track clicks and opens you can also add the CNAME record.<\/p>\n\n<p class=\"wp-block-paragraph\">5. <b>MX records should also be added<\/b>, unless you already have MX records for your domain pointed at another email service provider (e.g., Gmail).<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4415\" width=\"2560\" height=\"1300\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.25.25_PM-scaled.png\" alt=\"Mailgun receiving records dashboard\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.25.25_PM-scaled.png 2560w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.25.25_PM-300x152.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.25.25_PM-768x390.png 768w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.25.25_PM-1024x520.png 1024w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.25.25_PM-1536x780.png 1536w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/Screen_Shot_2020-05-28_at_3.25.25_PM-2048x1040.png 2048w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">Once you\u2019ve added the records and they\u2019ve propagated, your domain will be verified. <b>Note: it can take 24-48 hours for DNS changes to be verified.<\/b><\/p>\n\n<h3 class=\"wp-block-heading\">Common DNS Provider Documentation<\/h3>\n\n<p class=\"wp-block-paragraph\">Common providers are listed below. If yours is not listed, contact your DNS provider for assistance:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>GoDaddy: <a href=\"https:\/\/www.godaddy.com\/help\/add-an-mx-record-19234\" target=\"_tabs\" rel=\"noopener noreferrer\">MX<\/a> &#8211; <a href=\"https:\/\/www.godaddy.com\/help\/add-a-cname-record-19236\" target=\"_tabs\" rel=\"noopener noreferrer\">CNAME<\/a> &#8211; <a href=\"https:\/\/www.godaddy.com\/help\/add-a-txt-record-19232\" target=\"_tabs\" rel=\"noopener noreferrer\">TXT<\/a><\/li>\n\n\n\n<li>NameCheap: <a href=\"https:\/\/www.namecheap.com\/support\/knowledgebase\/subcategory.aspx\/10\/dns-questions\" target=\"_tabs\" rel=\"noopener noreferrer\">All Records<\/a><\/li>\n\n\n\n<li>Network Solutions: <a href=\"http:\/\/www.networksolutions.com\/support\/mx-records-mail-servers-2\/\" target=\"_tabs\" rel=\"noopener noreferrer\">MX<\/a> &#8211; <a href=\"http:\/\/www.networksolutions.com\/support\/cname-records-host-aliases-2\/\" target=\"_tabs\" rel=\"noopener noreferrer\">CNAME<\/a> &#8211; <a href=\"http:\/\/www.networksolutions.com\/support\/how-to-manage-advanced-dns-records\/\" target=\"_tabs\" rel=\"noopener noreferrer\">TXT<\/a><\/li>\n\n\n\n<li>Rackspace Email &amp; Apps: <a href=\"http:\/\/www.rackspace.com\/apps\/support\/portal\/1172\" target=\"_tabs\" rel=\"noopener noreferrer\">All Records<\/a><\/li>\n\n\n\n<li>Rackspace Cloud DNS: <a href=\"http:\/\/www.rackspace.com\/knowledge_center\/article\/rackspace-cloud-dns\" target=\"_tabs\" rel=\"noopener noreferrer\">Developer Guide<\/a><\/li>\n\n\n\n<li>Amazon Route 53: <a href=\"http:\/\/docs.aws.amazon.com\/Route53\/latest\/DeveloperGuide\/R53Console.html\" target=\"_tabs\" rel=\"noopener noreferrer\">Developer Guide<\/a><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Now you\u2019re all set! If you get stuck, check out our <a href=\"https:\/\/documentation.mailgun.com\/docs\/mailgun\/user-manual\/get-started\/#managing-user-roles\" target=\"_tabs\" rel=\"noopener noreferrer\">documentation for more in-depth information on DKIM and step-by-step setup guides<\/a>.<\/p>\n\n<h2 class=\"wp-block-heading\">What you need to remember about DKIM and its usage<\/h2>\n\n<p class=\"wp-block-paragraph\">Why be vulnerable when you can be validated? <b>DKIM is encrypted proof of your sender identity.<\/b> It\u2019s a useful tool that you can (and should) use to <a href=\"https:\/\/www.mailgun.com\/es\/solutions\/use-cases\/sending-email\/\" target=\"_tabs\" rel=\"noopener noreferrer\">send email to your mailing list<\/a>. By \u201csigning\u201d your emails, you signal that your organization is trustworthy.<\/p>\n\n<p class=\"wp-block-paragraph\"><b>DKIM offers your recipients protection from fraud, and boosts your sender reputation and deliverability rate by confirming your secure identify.<\/b> It\u2019s a small but crucial step \u2013 alongside other best practices, like cleaning and <a href=\"\/products\/inbox\/email-verification\/\" target=\"_tabs\" rel=\"noopener noreferrer\">validating your email list<\/a> \u2013 that strengthen your email program.<\/p>\n    <div data-content-type=\"longform\"  class=\"callout text-body-color px-5 py-6 px-md-6 px-lg-7 py-md-7 longform-spacings rounded-lg bg-light\" data-theme=\"light\">\r\n\r\n        <div class=\"content-body\"> Need more help convincing mailbox providers you&#x27;re really not a spammer in disguise? Learn more about <a href='https:\/\/www.mailgun.com\/es\/blog\/deliverability\/autenticacion-emails-documento-identidad-envios\/'>email authentication<\/a>, <a href='https:\/\/www.mailgun.com\/blog\/deliverability\/spf-records-basics\/'>SPF<\/a>, and <a href='https:\/\/www.mailgun.com\/es\/blog\/deliverability\/implementar-dmarc\/'>DMARC<\/a>, in our blog, and subscribe to our newsletter to stay in the loop.<\/div>\r\n    <\/div>\r\n\n<h2 class=\"wp-block-heading\">Leveraging other email authentications<\/h2>\n\n<p class=\"wp-block-paragraph\">DKIM is definitely a standard industry authentication, but more mailbox providers are <a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/gmail-and-yahoo-inbox-updates-2024\/\" target=\"_tabs\" rel=\"noopener noreferrer\">requiring senders to level up with DMARC<\/a>.<\/p>\n\n<p class=\"wp-block-paragraph\">While DKIM and SPF play crucial roles in email authentication, implementing DMARC (Domain-based Message Authentication, Reporting, and Conformance) policies adds an extra layer of security against email fraud. DMARC builds upon DKIM and SPF by providing domain owners with visibility into how their domains are being used for email authentication. It allows domain owners to specify a DMARC policy, instructing ISPs (Internet Service Providers) and receiving mail servers on how to handle emails that fail authentication checks. Configuring DMARC policies can range from monitoring only to quarantine or reject actions, providing granular control over email delivery. By leveraging DMARC alongside DKIM and SPF, organizations can significantly reduce the risk of email spoofing and phishing attacks.<\/p>\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n    <div data-content-type=\"longform\" id=\"accordion-id-block_95a8e6ea506f58b38338dc23ebaef44f\" class=\"accordion accordion-longform d-flex flex-column gap-3 my-3\">\r\n\r\n        <div class=\"acf-innerblocks-container\">\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_b35db6e7067048b074e75bbfed19a2ff_1693\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_b35db6e7067048b074e75bbfed19a2ff_1693\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_b35db6e7067048b074e75bbfed19a2ff_1693\">\r\n            What are the uses of DKIM?        <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_b35db6e7067048b074e75bbfed19a2ff_1693\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_b35db6e7067048b074e75bbfed19a2ff_1693\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li>Authenticate email messages to prevent spoofing and phishing.<\/li>\n\n\n\n<li>Signal trustworthiness to mailbox providers, enhancing deliverability.<\/li>\n\n\n\n<li>Comply with industry standards for secure email transmission, as promoted by Mailgun\u2019s deliverability expertise.<\/li>\n<\/ul>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_5aa2d561400c10112862502aa61cd641_2513\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_5aa2d561400c10112862502aa61cd641_2513\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_5aa2d561400c10112862502aa61cd641_2513\">\r\n            How do I setup DKIM?        <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_5aa2d561400c10112862502aa61cd641_2513\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_5aa2d561400c10112862502aa61cd641_2513\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li><b>Generate DKIM Keys:<\/b> Mailgun can generate the DKIM keys for you, with the option to choose the key length:\n<ul class=\"wp-block-list\">\n<li><b>1024-bit:<\/b> Easier to set up due to shorter record lengths, compatible with most DNS providers.<\/li>\n\n\n\n<li><b>2048-bit:<\/b> More secure but may require splitting the record into two parts due to longer length, as required by some DNS providers.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><b>Publish Public Key:<\/b> Add the public key as a TXT record in your domain\u2019s DNS settings. Mailgun provides detailed instructions for domain authentication.<\/li>\n\n\n\n<li><b>Enable Signing:<\/b> Configure Mailgun\u2019s settings to sign outgoing emails with the private key automatically.<\/li>\n<\/ul>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_850cd4a275b5ec13ac099ab7f2c854ef_2398\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_850cd4a275b5ec13ac099ab7f2c854ef_2398\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_850cd4a275b5ec13ac099ab7f2c854ef_2398\">\r\n            What is the purpose of DKIM?        <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_850cd4a275b5ec13ac099ab7f2c854ef_2398\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_850cd4a275b5ec13ac099ab7f2c854ef_2398\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li>Strengthen email security to protect recipients from spoofed emails.<\/li>\n\n\n\n<li>Maintain data integrity by ensuring the email content isn&#8217;t altered during transit.<\/li>\n\n\n\n<li>Build sender reputation, a critical focus for Mailgun\u2019s email deliverability services.<\/li>\n<\/ul>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_babea40ab0820c528e94dcd51855dcb8_9122\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_babea40ab0820c528e94dcd51855dcb8_9122\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_babea40ab0820c528e94dcd51855dcb8_9122\">\r\n            What are DKIM requirements?        <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_babea40ab0820c528e94dcd51855dcb8_9122\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_babea40ab0820c528e94dcd51855dcb8_9122\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li>Access to your DNS to add Mailgun-provided DKIM TXT records.<\/li>\n\n\n\n<li>An email-sending domain authenticated within Mailgun&#8217;s platform.<\/li>\n\n\n\n<li>Compliance with Mailgun\u2019s best practices, including regular monitoring and key rotation.<\/li>\n<\/ul>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_ca94de8f2cf45c94d925c0e13d026602_9725\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_ca94de8f2cf45c94d925c0e13d026602_9725\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_ca94de8f2cf45c94d925c0e13d026602_9725\">\r\n            What are DKIM rules and best practices?        <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_ca94de8f2cf45c94d925c0e13d026602_9725\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_ca94de8f2cf45c94d925c0e13d026602_9725\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<ul style=\"padding-top:var(--wp--preset--spacing--30);padding-bottom:var(--wp--preset--spacing--30)\" class=\"wp-block-list\">\n<li>Ensure the DKIM signature matches the public key in the domain&#8217;s DNS record.<\/li>\n\n\n\n<li>Rotate keys periodically, a practice recommended by Mailgun for enhanced security.<\/li>\n\n\n\n<li>Emails with altered headers or bodies will fail DKIM verification; follow Mailgun\u2019s deliverability guidelines to avoid such issues.<\/li>\n<\/ul>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n\n\r\n\r\n<div class=\"accordion-item py-2 border-bottom\">\r\n    <div\r\n        id=\"title-block_3c6d165ac38b465195cf085b20ffe826_8117\"\r\n        class=\"accordion-header pb-3\">\r\n\r\n        <button\r\n            class=\"accordion-button fs-5 collapsed\"\r\n            type=\"button\"\r\n            data-bs-toggle=\"collapse\"\r\n            data-bs-target=\"#accordion-collapse-block_3c6d165ac38b465195cf085b20ffe826_8117\"\r\n            aria-expanded=\"false\"\r\n            aria-controls=\"accordion-collapse-block_3c6d165ac38b465195cf085b20ffe826_8117\">\r\n            What size DKIM key should I use?        <\/button>\r\n    <\/div>\r\n    <div\r\n        id=\"accordion-collapse-block_3c6d165ac38b465195cf085b20ffe826_8117\"\r\n        class=\"accordion-collapse collapse\"\r\n        aria-labelledby=\"title-block_3c6d165ac38b465195cf085b20ffe826_8117\">\r\n        <div class=\"accordion-body pb-3\">\r\n            <div class=\"accordion-longform-inner\">\n\n<p class=\"wp-block-paragraph\">Mailgun allows you to choose a DKIM key length of <b>1024 bits<\/b> or <b>2048 bits<\/b>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>1024-bit:<\/b> Shorter and simpler to configure.<\/li>\n\n\n\n<li><b>2048-bit:<\/b> Offers greater security but involves splitting the DNS record into two parts due to its length. This may be required by certain DNS providers.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">DNS TXT records must adhere to the 255-character limit per segment.<\/p>\n\n<\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/div>\n<\/div>\r\n\r\n\r\n\r\n\r\n    <\/div>\r\n\r\n    \r\n\n<p class=\"wp-block-paragraph\">By integrating DKIM with Mailgun\u2019s tools and leveraging the flexibility to choose key lengths, you\u2019ll ensure optimal email deliverability and security while tailoring the setup to your DNS provider\u2019s capabilities.<\/p>\n    <div data-content-type=\"longform\" class=\"longform-spacings\">\r\n        <div class=\"cta bg-primary rounded-lg px-5 py-6 p-md-7 px-md-6\">\r\n                    <div class=\"form-subscription\">\r\n                            <div class=\"h4 mb-3\">\r\n                    Keep me posted! Get great resources in your inbox every week.                <\/div>\r\n                                    <form accept-charset=\"UTF-8\" action=\"\" enctype=\"multipart\/form-data\" data-form-subscription method=\"POST\" style=\"max-width: 400px;\">\r\n                <div class=\"row justify-content-between align-items-top g-2\">\r\n                    <div class=\"col-10\">\r\n                        <input type=\"email\" name=\"email\" class=\"form-control\" placeholder=\"Email\" autocomplete=\"email\" required>\r\n                        <div data-fs=\"error\" role=\"alert\" class=\"invalid-feedback\">\r\n                            Please complete this required field.                        <\/div>\r\n                    <\/div>\r\n                                            <div class=\"col-12 order-last mt-3 fs-xxs\" data-fs=\"acceptance\" style=\"display:none;\">\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-terms-5768\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"terms\">\r\n                                    <label for=\"formSubscriptionAcceptance-terms-5768\" class=\"form-check-label text-body-color\">\r\n                                        He le\u00eddo y acepto los T\u00e9rminos de Servicio.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                            \r\n                                <div class=\"form-check\">\r\n                                    <input id=\"formSubscriptionAcceptance-privacy-6664\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"privacy\">\r\n                                    <label for=\"formSubscriptionAcceptance-privacy-6664\" class=\"form-check-label text-body-color\">\r\n                                        He le\u00eddo y acepto la Pol\u00edtica de Privacidad.                                        <span class=\"hs-form-required\">*<\/span>\r\n                                    <\/label>\r\n                                <\/div>\r\n\r\n                                                    <\/div>\r\n                    \r\n                                            <div class=\"col-12 order-last fs-xxs mb-0 mt-2 text-body-color\">\r\n                            Send me the Mailjet Newsletter. I expressly agree to receive the newsletter and know that I can easily unsubscribe at any time.                        <\/div>\r\n                    \r\n                    <div class=\"col-2\">\r\n                        <button type=\"submit\" value=\"Submit\" aria-label=\"Submit\" class=\"btn btn-secondary btn-icon\">\r\n                            <svg aria-hidden=\"true\" data-url=\"https:\/\/www.mailgun.com\/wp-content\/plugins\/sinch-core\/assets\/icons\/layout\/chevron-right.svg\"><\/svg>\r\n                        <\/button>\r\n                    <\/div>\r\n                <\/div>\r\n\r\n                <input type=\"hidden\" name=\"formSubscriptionRecaptchaToken\" data-fs=\"recaptcha-token\">\r\n                <input type=\"hidden\" name=\"customListID\" value=\"\">\r\n\r\n            <\/form>\r\n            <div data-fs=\"message-success\" style=\"display: none;\">\r\n                <p class=\"mb-0 mt-2 text-body-color\">\r\n                    Check your inbox monthly for your Mailjet Newsletter!                <\/p>\r\n            <\/div>\r\n        <\/div>\r\n        <\/div>\r\n    <\/div>\r\n","protected":false},"excerpt":{"rendered":"<p>Puede que conozcas DKIM como una capa de autenticaci\u00f3n adicional para el email, pero es mucho m\u00e1s. Se trata de una firma digital que demuestra que eres quien dices ser. DKIM tambi\u00e9n ayuda con la entregabilidad de tus emails. \u00bfC\u00f3mo? Sigue leyendo y te daremos todos los detalles.<\/p>\n","protected":false},"author":27,"featured_media":4376,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[21],"class_list":["post-21695","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-deliverability"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00bfQu\u00e9 es DKIM? C\u00f3mo la autenticaci\u00f3n de emails protege tu dominio en 2026 - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"Descubre qu\u00e9 es DKIM, c\u00f3mo funciona y por qu\u00e9 es esencial para la autenticaci\u00f3n de emails, la prevenci\u00f3n del spoofing o suplantaci\u00f3n y la entregabilidad. Incluye los pasos de configuraci\u00f3n y los requisitos para el remitente en 2026.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/entender-dkim-como-funciona\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00bfQu\u00e9 es DKIM? 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