{"id":30305,"date":"2021-10-12T15:03:39","date_gmt":"2021-10-12T15:03:39","guid":{"rendered":"https:\/\/easydmarc.com\/blog\/?p=30305"},"modified":"2025-08-06T16:40:46","modified_gmt":"2025-08-06T16:40:46","slug":"como-configurar-dkim-opendkim-con-postfix","status":"publish","type":"post","link":"https:\/\/easydmarc.com\/blog\/es\/como-configurar-dkim-opendkim-con-postfix\/","title":{"rendered":"C\u00f3mo configurar DKIM (OpenDKIM) con Postfix"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Las claves de identificaci\u00f3n de dominio digitales (DKIM o DomainKeys Identified Mail en ingl\u00e9s) son un protocolo de autenticaci\u00f3n para mensajes de correo que permiten a los destinatarios verificar cuando un mensaje de correo proviene realmente del dominio del cual fue emitido. Dado que los correos de spam frecuentemente contienen encabezados falsificados, se hace necesaria este tipo de autenticaci\u00f3n. DKIM es un sistema que utiliza criptograf\u00eda para claves p\u00fablicas que permite a los remitentes firmar electr\u00f3nicamente sus correos electr\u00f3nicos para validarlos y agilizar el proceso de verificaci\u00f3n por parte de los destinatarios. DKIM tambi\u00e9n protege tus mensajes de correo contra la manipulaci\u00f3n, otorgando integridad de extremo a extremo en las comunicaciones, desde el momento en que se genera la firma hasta que el agente de transferencia de correo (MTA) procesa la validaci\u00f3n.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DKIM es implementado de m\u00faltiples maneras diferentes por cada sistema operativo y agente de trasferencia de correos que existe, por ejemplo, <\/span><b>Linux usa Postfix como su MTA<\/b><span style=\"font-weight: 400;\"> predeterminado, por lo cual tiene sentido cubrir todos los pasos de <\/span><b>implementaci\u00f3n de OpenDKIM para Postfix<\/b><span style=\"font-weight: 400;\">; de esta forma, los usuarios de CentOS podr\u00e1n instalar y <\/span><b>configurar OpenDKIM en Postfix<\/b><span style=\"font-weight: 400;\"> para la versi\u00f3n m\u00e1s actualizada de este sistema operativo.<\/span><\/p>\n<p><a href=\"https:\/\/app.easydmarc.com\/register?utm_source=article_bottom&amp;utm_medium=banner&amp;utm_campaign=article_bottom_banner\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-large wp-image-21054\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2020\/12\/Monitor-your-Business-Domain-with-EasyDMARC-1-1024x356.png\" alt=\"\" width=\"1024\" height=\"356\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2020\/12\/Monitor-your-Business-Domain-with-EasyDMARC-1-1024x356.png 1024w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2020\/12\/Monitor-your-Business-Domain-with-EasyDMARC-1-300x104.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2020\/12\/Monitor-your-Business-Domain-with-EasyDMARC-1-768x267.png 768w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2020\/12\/Monitor-your-Business-Domain-with-EasyDMARC-1.png 1440w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<h2><b>C\u00f3mo instalar y configurar OpenDKIM con Postfix en CentOS de Linux<\/b><\/h2>\n<h3><b>Paso 1: Instalaci\u00f3n<\/b><\/h3>\n<p>1. Primero, instala OpenDKIM.<\/p>\n<pre><code>sudo yum install opendkim <\/code><\/pre>\n<h3><b>Paso 2: Procede a configurar OpenDKIM<\/b><\/h3>\n<p>2. Edita el archivo de configuraci\u00f3n principal de OpenDKIM<\/p>\n<pre><code>sudo nano \/etc\/opendkim.conf\n\n3.<\/code>Busca la l\u00ednea \"Mode v\" y c\u00e1mbiala a \"Mode sv\"<\/pre>\n<p><i><span style=\"font-weight: 400;\">OpenDKIM est\u00e1 configurado de forma predeterminada en el modo de verificaci\u00f3n (v), el cual chequea las firmas DKIM de los mensajes de correo recibidos. Si cambias la configuraci\u00f3n al modo \u00absv\u00bb este nos permitir\u00e1 activar el modo de firma para todos los correos salientes.<\/span><\/i><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18786\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/1.png\" alt=\"Change \u201cMode v\u201d to \u201cMode sv\u201d\" width=\"698\" height=\"174\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/1.png 698w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/1-300x75.png 300w\" sizes=\"(max-width: 698px) 100vw, 698px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">4. En el mismo archivo de configuraci\u00f3n de OpenDKIM, busca las siguientes l\u00edneas y elimina el comentario (#)<\/span><\/p>\n<pre><span style=\"font-weight: 400;\"><code>Keyfile\n<\/code><\/span><span style=\"font-weight: 400;\"><code>KeyTable\n<\/code><\/span><span style=\"font-weight: 400;\"><code>SigningTable<\/code><\/span><span style=\"font-weight: 400;\"><code>\nExternalIgnoreList\n<\/code><\/span><span style=\"font-weight: 400;\"><code>InternalHosts<\/code><\/span><\/pre>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18787\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/2.png\" alt=\"Remove the Comment (#) for\" width=\"708\" height=\"335\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/2.png 708w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/2-300x142.png 300w\" sizes=\"(max-width: 708px) 100vw, 708px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">5. Al final de este archivo, agrega tu dominio<\/span><\/p>\n<pre><span style=\"font-weight: 400;\"><code><\/code><\/span>Domain <span style=\"color: #ff6600;\" data-darkreader-inline-color=\"\">yourdomain.com<\/span><\/pre>\n<p><span style=\"font-weight: 400;\">Tambien debes incluir el comando RequireSafeKeys Falso<\/span><\/p>\n<pre><span style=\"font-weight: 400;\"><code><\/code><\/span>RequireSafeKeys False<\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18789\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/3.png\" alt=\"Add \u201cRequireSafeKeys False\u201d\" width=\"604\" height=\"152\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/3.png 604w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/3-300x75.png 300w\" sizes=\"(max-width: 604px) 100vw, 604px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">6. A continuaci\u00f3n, debes editar el archivo de la tabla de firmas.<\/span><\/p>\n<pre><code>sudo nano \/etc\/opendkim\/SigningTable<\/code><\/pre>\n<p><span style=\"font-weight: 400;\">7. Ahora proceder\u00e1s a agregar la siguiente l\u00ednea al final de este archivo, el cual le indica a OpenDKIM que si un remitente en tu servidor est\u00e1 usando cualquier direcci\u00f3n @yourdomain.com (en este ejemplo, *@easydmarc.me), entonces este mensaje debe ser firmado con la clave identificadora por defecto._domainkey.yourdomain.com (en este ejemplo, *@easydmarc.me). ejemplo, predetermined._domainkey.easydmarc.me)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">*@yourdomain.com yourselector._domainkey.yourdomain.com<\/span><\/p>\n<pre><code>*@<span style=\"color: #ff6600;\" data-darkreader-inline-color=\"\">yourdomain.com<\/span> <span style=\"color: #ff0000;\" data-darkreader-inline-color=\"\">yourselector<\/span>._domainkey.<span style=\"color: #ff6600;\" data-darkreader-inline-color=\"\">yourdomain.com<\/span><\/code><\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18791\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/4.png\" alt=\"sudo nano \/etc\/opendkim\/SigningTable\" width=\"742\" height=\"191\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/4.png 742w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/4-300x77.png 300w\" sizes=\"(max-width: 742px) 100vw, 742px\" \/><\/p>\n<p><i><span style=\"font-weight: 400;\">Nota: el valor predeterminado es el selector DKIM, ten presente que cualquier dominio puede tener varias firmas DKIM y el selector DKIM te permite elegir una clave DKIM espec\u00edfica, la cual puedes usar con cualquier nombre de tu elecci\u00f3n, pero es necesario asegurarte de no tener una firma DKIM ya implementada con el mismo nombre de selector.<\/span><\/i><\/p>\n<p>8. Guarda y cierra el archivo de configuraci\u00f3n principal para OpenDKIM<\/p>\n<p>9. Ahora, edita el archivo KeyTable.<\/p>\n<pre><code>sudo nano \/etc\/opendkim\/KeyTable<\/code><\/pre>\n<p><span style=\"font-weight: 400;\">Agrega la siguiente l\u00ednea, que especifica la ubicaci\u00f3n de la clave DKIM privada.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">yourdomain.com:selector:\/etc\/opendkim\/keys\/yourdomain.com\/default.private<\/span><\/p>\n<p><span style=\"font-weight: 400;\">En esta captura de pantalla puedes ver como el selector se define como predeterminado<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18792\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/5.png\" alt=\"sudo nano \/etc\/opendkim\/KeyTable\" width=\"832\" height=\"137\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/5.png 832w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/5-300x49.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/5-768x126.png 768w\" sizes=\"(max-width: 832px) 100vw, 832px\" \/>10. Guarda y cierra el archivo.<\/p>\n<p><span style=\"font-weight: 400;\">11. A continuaci\u00f3n, debes <\/span><b>editar el archivo OpenDKIM<\/b><span style=\"font-weight: 400;\"> de hu\u00e9spedes de confianza.<\/span><\/p>\n<pre><code>sudo nano \/etc\/opendkim\/TrustedHosts<\/code><\/pre>\n<p><span style=\"font-weight: 400;\">127.0.0.0.1 y ::1 se incluyen en este archivo de forma predeterminada.<\/span><\/p>\n<p>12. Ahora agrega la siguiente l\u00ednea: *.yourdomain<b><\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18795\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/6.png\" alt=\"sudo nano \/etc\/opendkim\/TrustedHosts\" width=\"661\" height=\"176\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/6.png 661w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/6-300x80.png 300w\" sizes=\"(max-width: 661px) 100vw, 661px\" \/><\/p>\n<h3><b>Paso 3: Generar claves privadas y p\u00fablicas<\/b><\/h3>\n<p>1. Crea un nuevo directorio para tu dominio<\/p>\n<p><code>sudo mkdir \/etc\/opendkim\/keys\/<span style=\"color: #ff6600;\" data-darkreader-inline-color=\"\">yourdomain.com<\/span><\/code><\/p>\n<p><span style=\"font-weight: 400;\">2. Genera las claves usando la herramienta generadora de claves de OpenDKIM<\/span><\/p>\n<pre><code>sudo opendkim-genkey -b 1024 -d <span style=\"color: #ff6600;\" data-darkreader-inline-color=\"\">yourdomain.com<\/span> -D \/etc\/opendkim\/keys\/<span style=\"color: #ff6600;\" data-darkreader-inline-color=\"\">yourdomain.com<\/span> -s <span style=\"color: #ff0000;\" data-darkreader-inline-color=\"\">yourselector<\/span> -v<\/code><\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18796\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/7.png\" alt=\"sudo opendkim-genkey -b 1024 -d domain.com -D \/etc\/opendkim\/keys\/domain.com -s selector -v\" width=\"933\" height=\"44\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/7.png 933w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/7-300x14.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/7-768x36.png 768w\" sizes=\"(max-width: 933px) 100vw, 933px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">3. Puedes hacer que OpenDKIM sea el propietario de la clave<\/span><\/p>\n<pre><code>sudo chown opendkim:opendkim \/etc\/opendkim\/keys -R<\/code><b> <\/b><\/pre>\n<h3><b>Paso 4: Publica la clave p\u00fablica creada en tu DNS<\/b><\/h3>\n<p>1. Obt\u00e9n y muestra la clave p\u00fablica<\/p>\n<pre><code>sudo cat \/etc\/opendkim\/keys\/<span style=\"color: #ff6600;\" data-darkreader-inline-color=\"\">yourdomain.com<\/span>\/default.txt<\/code><\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18799\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/8.png\" alt=\"sudo cat \/etc\/opendkim\/keys\/domain.com\/default.txt\" width=\"962\" height=\"123\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/8.png 962w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/8-300x38.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/8-768x98.png 768w\" sizes=\"(max-width: 962px) 100vw, 962px\" \/>2. Implem\u00e9ntala en tu DNS (en este ejemplo puedes ver como la aplicamos en Cloudflare).<\/p>\n<p><span style=\"font-weight: 400;\">Notas importantes:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nombre\/Objetivo: yourselector._domainkey<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Contenido: Valor que copiado en la etapa anterior. Aseg\u00farate de eliminar los espacios y las comillas dobles.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18800\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/9.png\" alt=\"Implement the Public Key in your DNS\" width=\"1024\" height=\"287\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/9.png 1024w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/9-300x84.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/9-768x215.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">3. Despu\u00e9s de publicar la clave p\u00fablica DKIM en su DNS, debes confirmar que DKIM es v\u00e1lido usando la herramienta de b\u00fasqueda de registros DKIM de EasyDMARC.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-18802\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/10.png\" alt=\"easydmarc dkim lookup tool\" width=\"565\" height=\"334\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/10.png 843w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/10-300x177.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/10-768x454.png 768w\" sizes=\"(max-width: 565px) 100vw, 565px\" \/><\/p>\n<h3><b>Paso 5: Conecta Postfix a OpenDKIM<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Ahora que has configurado OpenDKIM, es hora de<\/span><b> implementar DKIM en Postfix<\/b><span style=\"font-weight: 400;\">, asi que sigamos el proceso de configuraci\u00f3n.<\/span><\/p>\n<p>1. Edita el archivo de configuraci\u00f3n principal de Postfix<\/p>\n<pre><code>sudo nano \/etc\/postfix\/main.cf<\/code><\/pre>\n<p><span style=\"font-weight: 400;\">2. Agrega las siguientes l\u00edneas al final del archivo: \u201cmain.cf\u201d, estas permitir\u00e1n que Postfix llame a OpenDKIM a trav\u00e9s del protocolo milter.<\/span><\/p>\n<pre><code>smtpd_milters = inet:127.0.0.1:8891\n<\/code><code>non_smtpd_milters = $smtpd_milters<\/code> <code>milter_default_action = accept <\/code><\/pre>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18805\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/11.png\" alt=\"open dkim configuration\" width=\"327\" height=\"211\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/11.png 327w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/11-300x194.png 300w\" sizes=\"(max-width: 327px) 100vw, 327px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">3. Guarda y cierra el archivo.<\/span><\/p>\n<p>4. Reinicia OpenDKIM y Postfix<\/p>\n<pre><code>sudo service opendkim restart<\/code><\/pre>\n<pre><code>sudo service postfix restart<\/code><\/pre>\n<h3><b>Paso 6: Comprueba que DKIM est\u00e1 funcionando<\/b><\/h3>\n<p>1. Env\u00eda un correo de prueba desde tu servidor para confirmar que DKIM est\u00e1 funcionando con Postfix.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-18813\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/12.png\" alt=\"Send a Test email and confirm DKIM is working\" width=\"511\" height=\"234\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/12.png 511w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/10\/12-300x137.png 300w\" sizes=\"(max-width: 511px) 100vw, 511px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">\u00a1Felicitaciones!, has <\/span><b>configurado OpenDKIM para Postfix<\/b><span style=\"font-weight: 400;\">, ahora puedes estar seguro que tus correos electr\u00f3nicos llegaran a sus destinatarios tal como fueron concebidos en su forma original.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Las claves de identificaci\u00f3n de dominio digitales (DKIM &#8230;<\/p>\n","protected":false},"author":6,"featured_media":25885,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[475,474],"tags":[],"class_list":["post-30305","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-configuracion-de-origen","category-conocimiento-base"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>C\u00f3mo configurar DKIM (OpenDKIM) con Postfix | EasyDMARC<\/title>\n<meta name=\"description\" content=\"C\u00f3mo configurar DKIM con OpenDKIM en Postfix: sigue esta gu\u00eda para habilitar firmas digitales, autenticar mensajes y reforzar la seguridad de tus correos.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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