{"id":21636,"date":"2022-12-12T00:00:00","date_gmt":"2022-12-12T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/mejores-listas-bloqueo-dns-no-todas-iguales\/"},"modified":"2026-09-15T17:31:20","modified_gmt":"2026-09-15T17:31:20","slug":"mejores-listas-bloqueo-dns-no-todas-iguales","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/mejores-listas-bloqueo-dns-no-todas-iguales\/","title":{"rendered":"Todo lo que debes saber sobre las listas de bloqueo de DNS"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The word \u201cblocklist\u201d can almost seem like something out of a movie \u2013 a little dramatic, silly, and a little unreal. Unfortunately, in the real world, blocklists are definitely something you need to be mindful of, especially when it comes to an email program.<\/p>\n\n<p class=\"wp-block-paragraph\">In this article, we\u2019ll tell you a little more about blocklists and how to avoid their drama. Specifically, we\u2019ll go over how DNS blocklists work, what to do if you\u2019re on a blocklist, and how to avoid being put on a blocklist in the first place.<\/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-8885\"><p class=\"h5 m-0\" id=\"toc-title-8885\">\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-a-blocklist-anyway\">What is a blocklist anyway?<\/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=\"#why-was-the-dns-blocklist-server-list-created\">Why was the DNS blocklist server list created?<\/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-do-dns-blocklists-work\">How do DNS blocklists work?<\/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=\"#which-blocklists-matter\">Which blocklists matter?<\/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-do-i-know-if-im-on-a-blocklist\">How do I know if I\u2019m on a blocklist?<\/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=\"#how-can-i-get-off-an-email-blocklist\">How can I get off an email blocklist?<\/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=\"#how-do-you-avoid-being-put-on-a-blocklist\">How do you avoid being put on a blocklist?<\/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=\"#wrapping-up\">Wrapping up<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">What is a blocklist anyway?<\/h2>\n\n<p class=\"wp-block-paragraph\">Before we run through the different types of email blocklists, let\u2019s cover what blocklists are. <a href=\"https:\/\/www.techopedia.com\/definition\/25745\/domain-name-system-based-list-dnsbl\" target=\"_tabs\" rel=\"noopener noreferrer\">DNS-based blocklists (DNSBL)<\/a> and <a href=\"https:\/\/www.techopedia.com\/definition\/25294\/real-time-blackhole-list-rbl\" target=\"_tabs\" rel=\"noopener noreferrer\">real-time blocklists (RBL)<\/a> are lists of IP addresses that are suspected of sending spam and are used to prevent unwanted email messages from reaching unsuspecting recipients. Domain name system (DNS)-based blocklists are based \u2013 as the name suggests \u2013 on their listed IP addresses\u2019 domain names. RBL are based on IP addresses that are caught in real-time. Simple, right?<\/p>\n\n<h2 class=\"wp-block-heading\">Why was the DNS blocklist server list created?<\/h2>\n\n<p class=\"wp-block-paragraph\">The DNS blocklist server list was created as an anti-spam mechanism, basically like AdBlock or AdGuard for your emails. Because of its creation, email providers could have a resource to see which IP addresses had a reputation for sending unwanted or malicious emails to recipients. They could use this list (and later, other lists like the RBL) to take effective action against spammers without harming normal ISPs. An important thing to note is that blocklists don\u2019t actually block your messages \u2013 the mailbox providers do.<\/p>\n\n<h2 class=\"wp-block-heading\">How do DNS blocklists work?<\/h2>\n\n<p class=\"wp-block-paragraph\">Alright, this is a bit of a tag-team effort. First, DNS blocklists flag your email messages based on certain factors. For instance, you might have a bad IP reputation or domain reputation. Or, you might be suddenly sending a high volume of email traffic. Or, your content might look like it contains malware or is a phishing attempt.<\/p>\n\n<p class=\"wp-block-paragraph\">Then, email clients like Gmail and Microsoft Outlook use this information from DNS blocklist services along with internal metrics to decide whether to block your message.<\/p>\n\n<p class=\"wp-block-paragraph\">Why is this important? Well, just being listed on a random blocklist isn\u2019t necessarily going to cause problems with your email deliverability. However, if you hit these mailbox providers\u2019 metrics and show up on some more reputable blocklists, that\u2019s when you run into problems.<\/p>\n\n<h2 class=\"wp-block-heading\">Which blocklists matter?<\/h2>\n\n<p class=\"wp-block-paragraph\">There are a lot of blocklists out there, and we mean <i>a lot<\/i>: check <a href=\"http:\/\/multirbl.valli.org\/\" target=\"_tabs\" rel=\"noopener noreferrer\">here<\/a> to see how many. These are created by large, reputable businesses, as well as lesser-known companies and sometimes <a href=\"https:\/\/www.spamhaus.org\/organization\/statement\/015\/fraudulent-dnsbl-uncovered-protected-sky-bad.psky.me\" target=\"_tabs\" rel=\"noopener noreferrer\">fraudsters<\/a>. Since pretty much anyone can create a blocklist, they aren\u2019t all treated the same by email providers \u2013 and you should focus on paying attention to the ones that matter most.<\/p>\n\n<p class=\"wp-block-paragraph\">So as an email sender, how do you decipher between the reputable blocklists and the fraudsters? Don\u2019t fret. We\u2019ve saved you some time digging through information on GitHub or StackOverflow, and here\u2019s our shortlist of some of the most reputable blocklists:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.spamhaus.org\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Spamhaus<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.spamcop.net\/\" target=\"_tabs\" rel=\"noopener noreferrer\">SpamCop<\/a><\/li>\n\n\n\n<li><a href=\"http:\/\/www.invaluement.com\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Invaluement<\/a><\/li>\n\n\n\n<li><a href=\"http:\/\/www.barrac\ufffdntral.org\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Barracuda<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.lashback.com\/\" target=\"_tabs\" rel=\"noopener noreferrer\">LashBack (Unsubscribe Block List)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/psbl.org\/\" target=\"_tabs\" rel=\"noopener noreferrer\">PSBL (Passive Spam Block List)<\/a><\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">How do I know if I\u2019m on a blocklist?<\/h2>\n\n<p class=\"wp-block-paragraph\">Your emails aren\u2019t going through. The thought flits through your head: <i>Am I blocked?<\/i><\/p>\n\n<p class=\"wp-block-paragraph\">If you\u2019ve <a href=\"https:\/\/www.mailgun.com\/blog\/deliverability\/awkward-dealing-sudden-blacklisting\/\" target=\"_tabs\" rel=\"noopener noreferrer\">landed on a DNS blocklist,<\/a> the blocklist vendor will usually send you a message informing you of your listing. However, if you suspect you\u2019ve been blocklisted, you can always manually check major blocklists to see if your domain name appears on their list.<\/p>\n\n<p class=\"wp-block-paragraph\">Of course, if you\u2019re using Mailgun as your email service provider (ESP), you can take advantage of our <a href=\"https:\/\/www.mailgun.com\/es\/products\/inbox\/deliverability\/blocklist-monitoring-service\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Blocklist Monitoring Service<\/a>. We\u2019ll do all the heavy-lifting for you and monitor in real time whether you\u2019re on a blocklist.<\/p>\n\n<h2 class=\"wp-block-heading\">How can I get off an email blocklist?<\/h2>\n\n<p class=\"wp-block-paragraph\">So you\u2019re on a blocklist. Don\u2019t worry; it\u2019s not the end of the world.<\/p>\n\n<p class=\"wp-block-paragraph\">To <a href=\"https:\/\/www.mailgun.com\/es\/blog\/deliverability\/como-eliminar-ip-dominio-lista-bloqueo-email\/\" target=\"_tabs\" rel=\"noopener noreferrer\">get off a blocklist<\/a>, follow these three easy steps:<\/p>\n\n<ol class=\"wp-block-list\">\n<li>Check the blocklist vendor\u2019s email informing you of your listing. They usually provide information on why you were blocklisted.<\/li>\n\n\n\n<li>Follow the blocklist vendor\u2019s instructions to clean up your email practices.<\/li>\n\n\n\n<li>Put in a blocklist removal request. Keep in mind that some ESPs, like Mailgun, will step in on your behalf to work with the blocklist vendor and speed up your delisting.<\/li>\n<\/ol>\n\n<p class=\"wp-block-paragraph\">If you don\u2019t take necessary measures to prevent a re-listing, you will get listed again, guaranteed. Frequent recurrences could lead to future removal requests being rejected, so fix your email problems before you\u2019re listed again. Your ESP will be happy to see you off the blocklist for good.<\/p>\n\n<h2 class=\"wp-block-heading\">How do you avoid being put on a blocklist?<\/h2>\n\n<p class=\"wp-block-paragraph\"><b>A word of caution: even if being put on a certain blocklist seems inconsequential, the fact remains that something in your email program caused your blocklisting to happen in the first place.<\/b><\/p>\n\n<p class=\"wp-block-paragraph\">Maintain best practices when it comes to your email program. Oftentimes, blocklists happen because you send a message to a spam trap monitored by one of these blocklist operators.<\/p>\n\n<p class=\"wp-block-paragraph\">If you do happen to get listed, take a close look at your email list collection practices. Here\u2019re some of our suggestions:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><b>Use double opt-in: <\/b>Incorporate some form of double opt-in or <a href=\"\/products\/inbox\/email-verification\/\" target=\"_tabs\" rel=\"noopener noreferrer\">email validation<\/a> into your sign-up process. Email verification can help weed out bad emails and ensure you\u2019re sending to real, interested consumers. And, always keep up with your email list hygiene.<\/li>\n\n\n\n<li><b>Check how you\u2019re sending:<\/b> It makes a big difference if you\u2019re sending from a shared mail server or IP versus your own dedicated IP address.<\/li>\n\n\n\n<li><b>Go over your email content:<\/b> Are you using many exclamation marks, spammy words, capitalizations, or emojis that look spammy to a blocklist service provider? Are you sending an all-image email?<\/li>\n\n\n\n<li><b>Avoid large email sizes: <\/b>Check your HTML email template to ensure your code is optimized. Spam filters often flag large emails as spam.<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Wrapping up<\/h2>\n\n<p class=\"wp-block-paragraph\">And that\u2019s a wrap on blocklists. They\u2019re a simple yet painful concept, and ignoring email best practices can leave you open to being put on one or more of them.<\/p>\n\n<p class=\"wp-block-paragraph\">Mailgun has a variety of services that help boost your deliverability and reputation and prevent blocklisting, like <a href=\"\/products\/inbox\/email-verification\/\" target=\"_tabs\" rel=\"noopener noreferrer\">email validation<\/a> and <a href=\"https:\/\/www.mailgun.com\/es\/funciones\/smtp-server\/\" target=\"_tabs\" rel=\"noopener noreferrer\">SMTP relay<\/a>, among others. The important thing is, no matter how you choose to use your email program, make sure you avoid blocklists and stay above the drama.<\/p>\n\n<p class=\"wp-block-paragraph\">If this was helpful, you\u2019re in luck. At Mailgun we like to break down every aspect of email from blocklists to deliverability. Subscribe to our newsletter and become email geeks like us.<\/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-7495\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"terms\">\r\n                                    <label for=\"formSubscriptionAcceptance-terms-7495\" 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-2844\" class=\"form-check-input\"\r\n                                        type=\"checkbox\" name=\"privacy\">\r\n                                    <label for=\"formSubscriptionAcceptance-privacy-2844\" 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>\u00bfQu\u00e9 es una lista de bloqueo? \u00bfY c\u00f3mo puedes evitarlas? Qu\u00e9date para descubrir qu\u00e9 son las listas de bloqueo y c\u00f3mo evitar problemas, c\u00f3mo funcionan las listas de bloqueo de DNS, qu\u00e9 hacer si est\u00e1s en una y c\u00f3mo prevenir que te incluyan en primer lugar.<\/p>\n","protected":false},"author":20,"featured_media":4376,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[21],"class_list":["post-21636","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 una lista de bloqueo de DNS y c\u00f3mo evitar entrar en una? - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"No todas las mejores listas de bloqueo de DNS son iguales. 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