{"id":3999,"date":"2026-01-13T08:50:26","date_gmt":"2026-01-13T08:50:26","guid":{"rendered":"https:\/\/all4sec.es\/blog\/?p=3999"},"modified":"2026-01-13T08:53:59","modified_gmt":"2026-01-13T08:53:59","slug":"hay-correos-licitos-que-van-a-acabar-en-el-spam","status":"publish","type":"post","link":"https:\/\/all4sec.es\/blog\/index.php\/2026\/01\/13\/hay-correos-licitos-que-van-a-acabar-en-el-spam\/","title":{"rendered":"Hay correos l\u00edcitos que van a acabar en el spam"},"content":{"rendered":"\n<h3 class=\"wp-block-heading has-text-align-center\">\u00a1Cuidado si env\u00edas muchos correos electr\u00f3nicos!<\/h3>\n\n\n\n<h5 class=\"wp-block-heading has-text-align-center\">Microsoft anunci\u00f3 hace unos meses una nueva regla que afectaba al env\u00edo y recepci\u00f3n de correos electr\u00f3nicos, en particular, en aquellas compa\u00f1\u00edas que hac\u00edan uso extensivo del correo electr\u00f3nico para completar campa\u00f1as de marketing.<\/h5>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Correos en el spam<\/strong><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-2-andrey-matveev-XUDseoo1IHc-unsplash-1024x768.jpg\" alt=\"\" class=\"wp-image-4003\" style=\"width:284px;height:auto\" srcset=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-2-andrey-matveev-XUDseoo1IHc-unsplash-1024x768.jpg 1024w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-2-andrey-matveev-XUDseoo1IHc-unsplash-300x225.jpg 300w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-2-andrey-matveev-XUDseoo1IHc-unsplash-768x576.jpg 768w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-2-andrey-matveev-XUDseoo1IHc-unsplash-1536x1152.jpg 1536w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-2-andrey-matveev-XUDseoo1IHc-unsplash.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>Hace unos meses, <a href=\"https:\/\/techcommunity.microsoft.com\/blog\/microsoftdefenderforoffice365blog\/strengthening-email-ecosystem-outlook%E2%80%99s-new-requirements-for-high%E2%80%90volume-senders\/4399730\">Microsoft<\/a> anunci\u00f3 que, a partir del 5 de mayo de 2025, si el dominio del remitente de un correo electr\u00f3nico no cumpl\u00eda con ciertas reglas, sus correos electr\u00f3nicos <strong>terminar\u00edan en la carpeta de spam<\/strong>.<\/p>\n\n\n\n<p>Se trataba de una medida que se alineaba con <strong>las pol\u00edticas que ya implementaron<\/strong> <strong>Google y Yahoo<\/strong> hace tiempo y que persegu\u00eda que el env\u00edo y recepci\u00f3n de correos electr\u00f3nicos fueran m\u00e1s seguros y con garant\u00edas de su origen.<\/p>\n\n\n\n<p>La medida afecta a los dominios que env\u00eden <strong>m\u00e1s de 5.000 correos electr\u00f3nicos por d\u00eda<\/strong> a direcciones de <a href=\"http:\/\/outlook.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">outlook.com<\/a>, <a href=\"http:\/\/outlook.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">hotmail.com<\/a> y <a href=\"http:\/\/live.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">live.com<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>DMARC, el concepto de referencia<\/strong><\/h3>\n\n\n\n<p><strong>DMARC<\/strong> \u2014<em>Domain-based Message Authentication, Reporting &amp; Conformance<\/em>\u2014 es el servicio de referencia sobre el que se sustenta esta medida y con ella la comprobaci\u00f3n del origen de los correos electr\u00f3nicos.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignright size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-3-post-letter-2828146_1280-1024x682.jpg\" alt=\"\" class=\"wp-image-4004\" style=\"width:329px;height:auto\" srcset=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-3-post-letter-2828146_1280-1024x682.jpg 1024w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-3-post-letter-2828146_1280-300x200.jpg 300w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-3-post-letter-2828146_1280-768x512.jpg 768w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-3-post-letter-2828146_1280.jpg 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>Se trata de un concepto, en ocasiones desconocido, que ayuda a proteger a los usuarios de aquellos correos que resultan ser <strong>falsos o enga\u00f1oso<\/strong>s.<\/p>\n\n\n\n<p>El servicio asegura que solo las personas autorizadas puedan enviar mensajes desde un dominio. Con ello se reduce el <strong>riesgo de fraudes<\/strong> tan extendidos como el<a href=\"https:\/\/all4sec.es\/blog\/index.php\/2024\/10\/01\/concienciacion-sobre-el-phishing\/\"> <em>phishing<\/em> o el <em>spoofing<\/em><\/a>.<\/p>\n\n\n\n<p>Al mismo tiempo, <strong>DMARC <\/strong>permite que las empresas puedan mejorar la entrega de sus correos y evitar que <a href=\"https:\/\/all4sec.es\/blog\/index.php\/2020\/09\/11\/estoy-harto-del-spam\/\">sean marcados como spam<\/a>.<\/p>\n\n\n\n<p>Y, para conseguir este objetivo, recurre a dos comprobaciones indispensables: <strong>SPF y DKIM<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u00bfQu\u00e9 es SPF?<\/strong><\/h3>\n\n\n\n<p>Expresado de forma sencilla, <a href=\"https:\/\/dmarcian.com\/what-is-spf\/\"><strong>SPF<\/strong><\/a> \u2014<strong>Sender Policy Framework<\/strong>\u2014 es como una lista de verificaci\u00f3n que dice a los servidores de correo qui\u00e9n est\u00e1 autorizado a enviar mensajes en nombre de un dominio.<\/p>\n\n\n\n<p>As\u00ed, si alguien intenta enviar un <strong>correo desde un lugar no autorizado<\/strong>, el correo puede rechazarse.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-4-thanhy-nguyen-DCg103FwjCg-unsplash-1024x683.jpg\" alt=\"\" class=\"wp-image-4005\" style=\"width:411px;height:auto\" srcset=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-4-thanhy-nguyen-DCg103FwjCg-unsplash-1024x683.jpg 1024w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-4-thanhy-nguyen-DCg103FwjCg-unsplash-300x200.jpg 300w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-4-thanhy-nguyen-DCg103FwjCg-unsplash-768x512.jpg 768w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-4-thanhy-nguyen-DCg103FwjCg-unsplash-1536x1024.jpg 1536w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-4-thanhy-nguyen-DCg103FwjCg-unsplash.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>Por ejemplo, si una compa\u00f1\u00eda es propietaria de un dominio llamado &#8220;<em>mi-empresa.com<\/em>&#8221; querr\u00e1 que solo se permita que los correos se env\u00eden desde un servidor de su proveedor de correo, definido como &#8220;<em>proveedor.com<\/em>&#8220;.<\/p>\n\n\n\n<p>De este modo, cualquier mensaje que provenga de otro servidor ser\u00e1 rechazado por el destinatario, ya que sabr\u00e1 que <strong>el remitente no est\u00e1 autorizado<\/strong> a ello.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u00bfQu\u00e9 es DKIM?<\/strong><\/h3>\n\n\n\n<p><a href=\"https:\/\/www.siteground.es\/kb\/que-es-dkim\/\"><strong>DKIM<\/strong><\/a> \u2014<strong>Domain Keys Identified Mail<\/strong>\u2014 es la segunda comprobaci\u00f3n que puede hacerse para verificar la validez de un correo electr\u00f3nico. B\u00e1sicamente, se trata de agregar una firma digital a cada correo enviado.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-5-toyamakanna-YZbfCjDmNY8-unsplash-1024x683.jpg\" alt=\"\" class=\"wp-image-4006\" style=\"width:376px;height:auto\" srcset=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-5-toyamakanna-YZbfCjDmNY8-unsplash-1024x683.jpg 1024w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-5-toyamakanna-YZbfCjDmNY8-unsplash-300x200.jpg 300w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-5-toyamakanna-YZbfCjDmNY8-unsplash-768x512.jpg 768w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-5-toyamakanna-YZbfCjDmNY8-unsplash-1536x1024.jpg 1536w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-5-toyamakanna-YZbfCjDmNY8-unsplash.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>Este mecanismo permite que el servidor que recibe el correo verifique que el mensaje realmente proviene del origen especificado y que <strong>no se ha alterado en el camino<\/strong>.<\/p>\n\n\n\n<p>Por ejemplo, si la misma compa\u00f1\u00eda anterior, \u201c<em>mi-empresa.com<\/em>\u201d, quiere lanzar una campa\u00f1a de publicidad de un producto, enviando correos electr\u00f3nicos a una lista de destinatarios, <strong>DKIM <\/strong>permitir\u00e1 que los receptores verifiquen que el mensaje realmente proviene de &#8220;<em>mi-empresa.com<\/em>&#8221; y que no ha sido alterado en el camino.<\/p>\n\n\n\n<p>As\u00ed, <a href=\"https:\/\/all4sec.es\/blog\/index.php\/2020\/06\/19\/hackeado\/\">si alguien intenta modificar el contenido del mensaje para enga\u00f1ar a los posibles clientes<\/a>, la firma <strong>DKIM <\/strong>ya no coincidir\u00e1 y <strong>el correo se marcar\u00e1 como sospechos<\/strong>o.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Pero volvamos a DMARC\u2026<\/strong><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/spam-1-1024x768.jpg\" alt=\"\" class=\"wp-image-4011\" style=\"width:309px;height:auto\" srcset=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/spam-1-1024x768.jpg 1024w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/spam-1-300x225.jpg 300w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/spam-1-768x576.jpg 768w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/spam-1-1536x1152.jpg 1536w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/spam-1.jpg 1920w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>Una vez que hemos entendido las dos comprobaciones, <strong>SPF <\/strong>y <strong>DKIM<\/strong>, sobre el origen de un correo electr\u00f3nico, <strong>DMARC <\/strong>unificar\u00e1 su verificaci\u00f3n indicando c\u00f3mo proceder en caso de que alguna de las comprobaciones falle. &nbsp;Es decir, <strong>DMARC <\/strong>se encargar\u00e1 de se\u00f1alar a los servidores de correo <strong>c\u00f3mo deben actuar si las comprobaciones de SPF y DKIM no resultan satisfactorias<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-1 wp-block-group-is-layout-flex\">\n<p>Por ejemplo, si alguna de las comprobaciones no se cumple, <strong>DMARC <\/strong>podr\u00eda optar simplemente por <strong>rechazar los mensajes o que estos se enviaran a la carpeta de spam<\/strong>.<\/p>\n<\/div>\n\n\n\n<p>As\u00ed, siguiendo con el ejemplo anterior, si alguien intenta enviar un correo no autorizado desde un servidor que dice llamarse &#8220;<em>mi-empresa.com<\/em>&#8221; pero que en realidad es un intento de phishing o spoofing, <strong>DMARC puede decidir que ese mensaje sea rechazado de inmediat<\/strong>o.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u00bfC\u00f3mo se activa el servicio DMARC?<\/strong><\/h3>\n\n\n\n<p>Para las empresas que a\u00fan no han implementado <strong>DMARC <\/strong>es hora pues de actuar.<\/p>\n\n\n\n<p>No solo es importante para evitar que sus correos se pierdan en el limbo del spam, sino tambi\u00e9n para proteger la reputaci\u00f3n de la compa\u00f1\u00eda y la seguridad de sus correos.<\/p>\n\n\n\n<p>La forma de habilitar <strong>DMARC <\/strong>es relativamente sencilla. Solo es necesario crear un <strong>registro DMARC en el DNS del dominio de la empresa<\/strong>.<\/p>\n\n\n\n<p>Ese registro debe tener una <strong>estructura parecida a la siguiente<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"679\" src=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-6-DNS-DMARC-1024x679.jpg\" alt=\"\" class=\"wp-image-4007\" style=\"width:620px;height:auto\" srcset=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-6-DNS-DMARC-1024x679.jpg 1024w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-6-DNS-DMARC-300x199.jpg 300w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-6-DNS-DMARC-768x509.jpg 768w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-6-DNS-DMARC.jpg 1115w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>Una vez definidas las acciones a realizar \u2014tras las comprobaciones del <strong>SPF y DKIM<\/strong>\u2014 solo habr\u00e1 que guardar los cambios y esperar un tiempo para que esa informaci\u00f3n <strong><a href=\"https:\/\/all4sec.es\/blog\/index.php\/2021\/10\/08\/dns-el-deseado-listin-telefonico-de-internet\/\">se propague por todos los servicios de DNS<\/a><\/strong> \u2014esto puede tardar desde unos minutos hasta 48 horas.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Soluciones avanzadas para DMARC<\/strong><\/h3>\n\n\n\n<p>Aunque la configuraci\u00f3n de <strong>DMARC<\/strong> puede hacerse <strong>de forma manual<\/strong>, con los permisos de administraci\u00f3n adecuados, actualmente existen herramientas avanzadas que ayudan a configurar y verificar si un dominio est\u00e1 cumpliendo las normas definidas por <strong>DMARC<\/strong>, sobre todo en aquellas compa\u00f1\u00edas que disponen de m\u00faltiples dominios y realizan numerosas campa\u00f1as de marketing.&nbsp;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"483\" height=\"317\" src=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-8-RS-CIsco-DMARC.jpg\" alt=\"\" class=\"wp-image-4008\" style=\"width:358px;height:auto\" srcset=\"https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-8-RS-CIsco-DMARC.jpg 483w, https:\/\/all4sec.es\/blog\/wp-content\/uploads\/2026\/01\/MS-SP-8-RS-CIsco-DMARC-300x197.jpg 300w\" sizes=\"(max-width: 483px) 100vw, 483px\" \/><\/figure><\/div>\n\n\n<p>Por ejemplo, <a href=\"https:\/\/redsift.com\/\">Red Sift OnDMARC<\/a> es una de esas herramientas que pueden gestionar f\u00e1cilmente la configuraci\u00f3n de los servicios <strong>DMARC<\/strong>, la autenticaci\u00f3n de los correos y recibir informes sobre posibles i<strong>ntentos de suplantaci\u00f3n<\/strong>.<\/p>\n\n\n\n<p>En resumen, las nuevas exigencias de <strong>Microsoft<\/strong> son una llamada a la acci\u00f3n. Ignorar estas reglas podr\u00eda causar problemas serios en muchas compa\u00f1\u00edas.<\/p>\n\n\n\n<p>Sin embargo, si se act\u00faa ahora, no solo se evitar\u00e1n esos problemas, sino que tambi\u00e9n se mejorar\u00e1 la <strong>confianza de los destinatarios<\/strong> en las comunicaciones y en los mensajes recibidos.<\/p>\n\n\n\n<p>Usted decide. Pero, si no lo ha hecho ya, recuerde que posiblemente es hora de implantar <strong>DMARC<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft anunci\u00f3 hace unos meses una nueva regla que afectaba al env\u00edo y recepci\u00f3n de correos electr\u00f3nicos, en particular, en aquellas compa\u00f1\u00edas que hac\u00edan uso extensivo del correo electr\u00f3nico para completar campa\u00f1as de marketing.<\/p>\n","protected":false},"author":3,"featured_media":4002,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[2,44],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hay correos l\u00edcitos que van a acabar en el spam - all4sec.es<\/title>\n<meta name=\"description\" content=\"Hay correos l\u00edcitos que van a acabar en el spam. 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