{"id":7043,"date":"2015-07-22T09:02:25","date_gmt":"2015-07-22T07:02:25","guid":{"rendered":"https:\/\/test-blog.mailfence.com\/?p=7043"},"modified":"2025-09-17T12:23:30","modified_gmt":"2025-09-17T10:23:30","slug":"mailfence-implementa-spf-sender-policy-framework-2","status":"publish","type":"post","link":"https:\/\/blog.mailfence.com\/es\/mailfence-implementa-spf-sender-policy-framework-2\/","title":{"rendered":"Mailfence implementa SPF (Sender Policy Framework)"},"content":{"rendered":"<p><strong>El Convenio de Remitentes (<a href=\"https:\/\/blog.mailfence.com\/es\/spf-dkim-y-dmarc-defensa-contra-la-suplantacion-spoofing-en-dominios-personalizados\/\">SPF,<\/a> del ingl\u00e9s \u00abSender Policy Framework\u00bb)<\/strong>, es un sistema sencillo para validaci\u00f3n de <a href=\"https:\/\/es.wikipedia.org\/wiki\/Correo_electr%C3%B3nico\">correo electr\u00f3nico<\/a>, dise\u00f1ado para detectar s<a href=\"https:\/\/es.wikipedia.org\/wiki\/Email_spoofing\">uplantaciones de identidad (spoofing)<\/a> en correo electr\u00f3nico ofreciendo un mecanismo que permite a los<a href=\"https:\/\/es.wikipedia.org\/wiki\/Email_spoofing\"> intercambiadores de correo electr\u00f3nico<\/a> el verificar que el correo entrante de un dominio proviene de un host autorizado por los administradores de este dominio. La lista de hosts autorizados para env\u00edos para un dominio dado se publica en los registros de <a href=\"https:\/\/es.wikipedia.org\/wiki\/Sistema_de_nombres_de_dominio\">Sistema de Nombres de Dominio<\/a> (DNS, del ingl\u00e9s Domain Name System) en forma de un <a href=\"https:\/\/es.wikipedia.org\/wiki\/Anexo:Tipos_de_registros_DNS\">registro TXT<\/a> con un formato especial. El <a href=\"https:\/\/en.wikipedia.org\/wiki\/Email_spam\">env\u00edo de spam<\/a> y el <a href=\"https:\/\/es.wikipedia.org\/wiki\/Phishing\">phishing<\/a> con frecuencia usan direcciones de remitente falsificadas, de modo que el publicar y verificar los registros de Convenio de Remitentes (Sender Policy Framework) pueden considerarse <a href=\"https:\/\/es.wikipedia.org\/wiki\/Antispam\">t\u00e9cnicas antispam<\/a>.<\/p>\n<p>Al publicar el registro del convenio de remitentes (sender policy framework), es menos probable que los <a href=\"https:\/\/blog.mailfence.com\/es\/subdireccionamiento-para-rastrear-a-los-spammers\/\">spammers<\/a> y los phishers se dediquen a falsificar correos electr\u00f3nicos fingiendo que provienen de mailfence.com, porque es mucho m\u00e1s probable que los correos electr\u00f3nicos falsificados sean interceptados por los filtros antispam que verifiquen el registro de SPF. Por lo tanto, un dominio protegido por SPF es menos atractivo para spammers y phishers. Como un dominio protegido por SPF es menos atractivo como direcci\u00f3n suplantada, es menos probable que resulte a\u00f1adido a la lista negra por los filtros antispam, lo que en \u00faltima instancia lleva a una mayor probabilidad de que el correo electr\u00f3nico leg\u00edtimo del dominio llegue correctamente.<\/p>\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"100846\" class=\"elementor elementor-100846 elementor-100761\" data-elementor-post-type=\"elementor_library\">\n\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-124e1725 elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"124e1725\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-654e4e21\" data-id=\"654e4e21\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3a3b1a23 elementor-widget elementor-widget-text-editor\" data-id=\"3a3b1a23\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Mailfence &#8211; Su paquete de productividad seguro<\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c004279 elementor-widget elementor-widget-text-editor\" data-id=\"2c004279\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Recupere su privacidad con<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-83e0dd6 elementor-icon-list--layout-inline elementor-align-center elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"83e0dd6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items elementor-inline-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-envelope-open-text\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M176 216h160c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16H176c-8.84 0-16 7.16-16 16v16c0 8.84 7.16 16 16 16zm-16 80c0 8.84 7.16 16 16 16h160c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16H176c-8.84 0-16 7.16-16 16v16zm96 121.13c-16.42 0-32.84-5.06-46.86-15.19L0 250.86V464c0 26.51 21.49 48 48 48h416c26.51 0 48-21.49 48-48V250.86L302.86 401.94c-14.02 10.12-30.44 15.19-46.86 15.19zm237.61-254.18c-8.85-6.94-17.24-13.47-29.61-22.81V96c0-26.51-21.49-48-48-48h-77.55c-3.04-2.2-5.87-4.26-9.04-6.56C312.6 29.17 279.2-.35 256 0c-23.2-.35-56.59 29.17-73.41 41.44-3.17 2.3-6 4.36-9.04 6.56H96c-26.51 0-48 21.49-48 48v44.14c-12.37 9.33-20.76 15.87-29.61 22.81A47.995 47.995 0 0 0 0 200.72v10.65l96 69.35V96h320v184.72l96-69.35v-10.65c0-14.74-6.78-28.67-18.39-37.77z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Mensajes<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-calendar-alt\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M148 288h-40c-6.6 0-12-5.4-12-12v-40c0-6.6 5.4-12 12-12h40c6.6 0 12 5.4 12 12v40c0 6.6-5.4 12-12 12zm108-12v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm96 0v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm-96 96v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm-96 0v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm192 0v-40c0-6.6-5.4-12-12-12h-40c-6.6 0-12 5.4-12 12v40c0 6.6 5.4 12 12 12h40c6.6 0 12-5.4 12-12zm96-260v352c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V112c0-26.5 21.5-48 48-48h48V12c0-6.6 5.4-12 12-12h40c6.6 0 12 5.4 12 12v52h128V12c0-6.6 5.4-12 12-12h40c6.6 0 12 5.4 12 12v52h48c26.5 0 48 21.5 48 48zm-48 346V160H48v298c0 3.3 2.7 6 6 6h340c3.3 0 6-2.7 6-6z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Calendarios<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-folder\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M464 128H272l-54.63-54.63c-6-6-14.14-9.37-22.63-9.37H48C21.49 64 0 85.49 0 112v288c0 26.51 21.49 48 48 48h416c26.51 0 48-21.49 48-48V176c0-26.51-21.49-48-48-48zm0 272H48V112h140.12l54.63 54.63c6 6 14.14 9.37 22.63 9.37H464v224z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Documentos<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item elementor-inline-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-users-cog\" viewBox=\"0 0 640 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M610.5 341.3c2.6-14.1 2.6-28.5 0-42.6l25.8-14.9c3-1.7 4.3-5.2 3.3-8.5-6.7-21.6-18.2-41.2-33.2-57.4-2.3-2.5-6-3.1-9-1.4l-25.8 14.9c-10.9-9.3-23.4-16.5-36.9-21.3v-29.8c0-3.4-2.4-6.4-5.7-7.1-22.3-5-45-4.8-66.2 0-3.3.7-5.7 3.7-5.7 7.1v29.8c-13.5 4.8-26 12-36.9 21.3l-25.8-14.9c-2.9-1.7-6.7-1.1-9 1.4-15 16.2-26.5 35.8-33.2 57.4-1 3.3.4 6.8 3.3 8.5l25.8 14.9c-2.6 14.1-2.6 28.5 0 42.6l-25.8 14.9c-3 1.7-4.3 5.2-3.3 8.5 6.7 21.6 18.2 41.1 33.2 57.4 2.3 2.5 6 3.1 9 1.4l25.8-14.9c10.9 9.3 23.4 16.5 36.9 21.3v29.8c0 3.4 2.4 6.4 5.7 7.1 22.3 5 45 4.8 66.2 0 3.3-.7 5.7-3.7 5.7-7.1v-29.8c13.5-4.8 26-12 36.9-21.3l25.8 14.9c2.9 1.7 6.7 1.1 9-1.4 15-16.2 26.5-35.8 33.2-57.4 1-3.3-.4-6.8-3.3-8.5l-25.8-14.9zM496 368.5c-26.8 0-48.5-21.8-48.5-48.5s21.8-48.5 48.5-48.5 48.5 21.8 48.5 48.5-21.7 48.5-48.5 48.5zM96 224c35.3 0 64-28.7 64-64s-28.7-64-64-64-64 28.7-64 64 28.7 64 64 64zm224 32c1.9 0 3.7-.5 5.6-.6 8.3-21.7 20.5-42.1 36.3-59.2 7.4-8 17.9-12.6 28.9-12.6 6.9 0 13.7 1.8 19.6 5.3l7.9 4.6c.8-.5 1.6-.9 2.4-1.4 7-14.6 11.2-30.8 11.2-48 0-61.9-50.1-112-112-112S208 82.1 208 144c0 61.9 50.1 112 112 112zm105.2 194.5c-2.3-1.2-4.6-2.6-6.8-3.9-8.2 4.8-15.3 9.8-27.5 9.8-10.9 0-21.4-4.6-28.9-12.6-18.3-19.8-32.3-43.9-40.2-69.6-10.7-34.5 24.9-49.7 25.8-50.3-.1-2.6-.1-5.2 0-7.8l-7.9-4.6c-3.8-2.2-7-5-9.8-8.1-3.3.2-6.5.6-9.8.6-24.6 0-47.6-6-68.5-16h-8.3C179.6 288 128 339.6 128 403.2V432c0 26.5 21.5 48 48 48h255.4c-3.7-6-6.2-12.8-6.2-20.3v-9.2zM173.1 274.6C161.5 263.1 145.6 256 128 256H64c-35.3 0-64 28.7-64 64v32c0 17.7 14.3 32 32 32h65.9c6.3-47.4 34.9-87.3 75.2-109.4z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\"><b>Grupos<\/b><\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-436babb elementor-align-center elementor-widget elementor-widget-button\" data-id=\"436babb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/mailfence.com\/es\/#pricing\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Obtener Mailfence gratis<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\n<h2>Ventajas del Sender Policy Framework<\/h2>\n<p>El SPF tiene ventajas potenciales m\u00e1s all\u00e1 de ayudar a identificar correo no deseado. Particularmente, si un remitente ofrece informaci\u00f3n de SPF, entonces los destinatarios pueden usar los resultados \u00abPASS\u00bb de SPF en combinaci\u00f3n con una lista blanca para identificar a los remitentes confiables conocidos. Algunos escenarios, como sistemas comprometidos y remitentes compartidos de correo limitan estos usos.<\/p>\n<p>El <a href=\"https:\/\/es.wikipedia.org\/wiki\/Protocolo_para_transferencia_simple_de_correo\">Protocolo para Transferencia Simple de Correo<\/a> le permite a cualquier ordenador enviar correo electr\u00f3nico pretendiendo que este proviene de cualquier direcci\u00f3n espec\u00edfica. Esto es explotado por los <a href=\"https:\/\/en.wikipedia.org\/wiki\/Email_spam\">spammers<\/a>, quienes frecuentemente emplean direcciones falsificadas de<a href=\"https:\/\/en.wikipedia.org\/wiki\/Email_address\"> correo electr\u00f3nico<\/a>, cosa que vuelve m\u00e1s dif\u00edcil el rastrear el origen de un mensaje, y m\u00e1s f\u00e1cil para los spammers ocultar sus identidades y as\u00ed evitar responsabilidades. Tambi\u00e9n se emplea en t\u00e9cnicas de <a href=\"https:\/\/es.wikipedia.org\/wiki\/Phishing\">phishing<\/a>, donde los usuarios pueden ser enga\u00f1ados para que revelen informaci\u00f3n privada en respuesta a un correo electr\u00f3nico supuestamente enviado por una organizaci\u00f3n, como un banco.<\/p>\n<p>El SPF permite al usuario de un dominio de internet el especificar cu\u00e1les ordenadores est\u00e1n autorizados para enviar correo electr\u00f3nico con direcciones de remitente en estas direcciones, usando los registros del <a href=\"https:\/\/es.wikipedia.org\/wiki\/Sistema_de_nombres_de_dominio\">Sistema de Nombres de Dominio<\/a>. Los destinatarios que verifiquen la informaci\u00f3n de SPF en los <a href=\"https:\/\/en.wikipedia.org\/wiki\/TXT_record\">registros TXT<\/a> tienen la libertad de rechazar mensajes de fuentes no autorizadas antes de recibir el cuerpo del mensaje. As\u00ed, los principios de operaci\u00f3n son similares a los empleados en las Listas Negras Basadas en Sistemas de Nombres de Dominio (<a href=\"https:\/\/en.wikipedia.org\/wiki\/DNSBL\">DNSBL<\/a>, del ingl\u00e9s Domain Name System-based Blackhole List), excepto por el hecho de que el SPF usa el esquema de delegaci\u00f3n de autoridad del Sistema de Nombres de Dominio. Las pr\u00e1cticas actuales obligan al uso de registros TXT, al igual que ocurr\u00eda con las primeras implementaciones. Durante cierto per\u00edodo, un nuevo tipo de registro (SPF, tipo 99) fue registrado y puesto a disposici\u00f3n en software DNS com\u00fan. La idea de usar los registros TXT para SPF era que esto sirviera como mecanismo de transici\u00f3n en ese momento. En la RFC experimental, <a href=\"https:\/\/tools.ietf.org\/html\/rfc4408\">RFC 4408<\/a>, secci\u00f3n 3.1.1, se sugiere que \u00abUn nombre de dominio conforme con SPF DEBER\u00cdA tener registros SPF de ambos tipos de RR\u00bb. El est\u00e1ndar propuesto, RFC <a href=\"https:\/\/tools.ietf.org\/html\/rfc7208\">7208<\/a>, indica que \u00abEl uso de tipos de RR de DNS alternativos tuvo soporte en la fase experimental del SPF, pero este soporte ha sido descontinuado\u00bb.<\/p>\n<p>La direcci\u00f3n de remitente se transmite al principio del di\u00e1logo SMTP. Si el <a href=\"https:\/\/es.wikipedia.org\/wiki\/Servidor\">servidor<\/a> rechaza al remitente, el <a href=\"https:\/\/es.wikipedia.org\/wiki\/Cliente_(inform%C3%A1tica)\">cliente<\/a> no autorizado deber\u00eda recibir un mensaje de rechazo, y si este cliente estaba haciendo una retransmisi\u00f3n para un <a href=\"https:\/\/es.wikipedia.org\/wiki\/Servidor_de_correo\">agente de transferencia de mensajes<\/a> (MTA), es posible que se genere un <a href=\"https:\/\/en.wikipedia.org\/wiki\/Bounce_message\">mensaje de rechazo<\/a> a la direcci\u00f3n que originalmente enviaba el mensaje. Si el servidor acepta al remitente, y por consiguiente tambi\u00e9n acepta los destinatarios y el cuerpo del mensaje, deber\u00eda insertar un campo de Camino-de-Regreso en el encabezado del mensaje para poder guardar la direcci\u00f3n del remitente.\u00a0 Si bien la direcci\u00f3n en el Camino-de-Retorno suele coincidir con otras direcciones originarias en el encabezado del correo tales como \u00abDe\u00bb o \u00abRemitente\u00bb, este no es necesariamente el caso, y el SPF no evita la falsificaci\u00f3n de estas otras direcciones.<\/p>\n<p>Los spammers pueden enviar correos con un resultado \u00abPASS\u00bb para SPF si tienen una cuenta en un dominio con pol\u00edtica de remitentes, o si hacen uso inapropiado de un sistema comprometido en este dominio. Sin embargo, hacer esto hace m\u00e1s f\u00e1cil rastrear al spammer.<\/p>\n<h2>Principales beneficiarios del Sender Policy Framework<\/h2>\n<p>Los principales beneficiarios del Convenio de Remitentes (SPF) son los propietarios de las direcciones de correo electr\u00f3nico falsificadas en el Camino-de-Retorno. Estos reciben grandes cantidades de mensajes de error no deseados y otras respuestas autom\u00e1ticas. Si estos destinatarios usaran el SPF para especificar sus direcciones IP leg\u00edtimas y determinaran el valor FAIL para todas las dem\u00e1s direcciones, los destinatarios que verificasen el SPF podr\u00edan rechazar las falsificaciones, reduciendo el \u00abbackscatter\u00bb (<a href=\"https:\/\/en.wikipedia.org\/wiki\/Backscatter_(email)\">retro dispersi\u00f3n<\/a>) o elimin\u00e1ndolo totalmente.<\/p>\n<p>Mailfence es un paquete de webmail <a href=\"https:\/\/mailfence.com\/es\/e-mail-seguro.jsp\">seguro<\/a> y <a href=\"https:\/\/mailfence.com\/es\/e-mail-privado.jsp\">privado<\/a>.<\/p>\n<p>S\u00edganos en <a href=\"https:\/\/twitter.com\/mailfence\" target=\"_blank\" rel=\"noopener noreferrer\">twitter<\/a>\/<a href=\"https:\/\/www.reddit.com\/r\/mailfence\" target=\"_blank\" rel=\"noopener noreferrer\">reddit<\/a> y mant\u00e9ngase actualizado en todo momento.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El Convenio de Remitentes (SPF, del ingl\u00e9s \u00abSender Policy Framework\u00bb), es un sistema sencillo para validaci\u00f3n de correo electr\u00f3nico, dise\u00f1ado para detectar suplantaciones de identidad (spoofing) en correo electr\u00f3nico ofreciendo un mecanismo que permite a los intercambiadores de correo electr\u00f3nico el verificar que el correo entrante de un dominio proviene de un host autorizado por [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":85956,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18607,857],"tags":[],"class_list":["post-7043","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novedades-de-mailfence","category-seguridad"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Sender Policy Framework (SFP): Mailfence lo implementa<\/title>\n<meta name=\"description\" content=\"Mailfence ha implementado el SPF (Sender Policy Framework). 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