[{"data":1,"prerenderedAt":1560},["ShallowReactive",2],{"blog-api:articulos\u002F{slug}:registro-spf-que-es-como-funciona-configurar:1:::":3,"i18nPorPagina":787},{"estado":4,"data":5,"meta":786},"ok",{"slug":6,"ruta":7,"titulo":8,"extracto":9,"imagen":10,"publicado":17,"actualizado":18,"minutos_lectura":19,"etiqueta_principal":20,"meta_titulo":23,"meta_descripcion":24,"og":25,"autor":28,"etiquetas":32,"bloques":43,"relacionados":740,"json_ld":777},"registro-spf-que-es-como-funciona-configurar","\u002Fregistro-spf-que-es-como-funciona-configurar\u002F","Registro SPF: qué es, cómo funciona y cómo configurarlo correctamente","El registro SPF (Sender Policy Framework) es un mecanismo DNS que declara qué servidores pueden enviar correo en nombre de tu dominio. Sin él, tu email puede ser rechazado, marcado como spam o suplantado. Guía completa con ejemplos reales.",{"fichero":11,"url":12,"alt":13,"ancho":14,"alto":15,"pie":16},"d1f976fafa75f8d4f63726df2267129ce09e8a06ac3c530027d8d8df8c36020b.jpg","https:\u002F\u002Fimg.sys4net.com\u002Fm\u002Fimg\u002Fd1f976fafa75f8d4f63726df2267129ce09e8a06ac3c530027d8d8df8c36020b.jpg","Panel de gestión de registros DNS mostrando tipos de registros A, AAAA, CNAME, TXT y MX con valores y TTL para configurar SPF",2000,1125,null,"2026-06-02T09:25:27+02:00","2026-11-10T10:28:13+01:00",8,{"slug":21,"nombre":21,"ruta":22},"correo","\u002Ftag\u002Fcorreo\u002F","Registro SPF: qué es y cómo configurarlo paso a paso │ sys4net","El registro SPF declara qué servidores pueden enviar correo en nombre de tu dominio. Cómo crearlo en el DNS y verificarlo para que tu correo no acabe en spam.",{"titulo":8,"descripcion":26,"imagen":27},"El registro SPF protege tu dominio contra la suplantación de identidad y el spam. Guía completa con ejemplos de sintaxis, comandos de verificación y preguntas frecuentes.",{"fichero":11,"url":12,"alt":13,"ancho":14,"alto":15,"pie":16},{"slug":29,"nombre":30,"ruta":31},"sys4net","sys4net Data Center","\u002Fauthor\u002Fsys4net\u002F",[33,34,37,40],{"slug":21,"nombre":21,"ruta":22},{"slug":35,"nombre":35,"ruta":36},"antispam","\u002Ftag\u002Fantispam\u002F",{"slug":38,"nombre":38,"ruta":39},"seguridad","\u002Ftag\u002Fseguridad\u002F",{"slug":41,"nombre":41,"ruta":42},"dns","\u002Ftag\u002Fdns\u002F",[44,49,63,67,79,91,95,99,126,138,142,146,180,184,192,203,214,218,222,226,231,233,237,344,348,352,354,358,360,364,366,370,372,376,430,434,448,452,456,460,470,472,478,480,488,492,506,510,551,555,559,567,577,595,599,619,623,634,638,642,646,650,654,661,665,708,712,716,727],{"type":45,"content":46},"heading",[47],{"t":48},"¿Qué es el registro SPF?",{"type":50,"content":51},"paragraph",[52,54,57,59,61],{"t":53},"El ",{"t":55,"b":56},"registro SPF",true,{"t":58}," (",{"t":60,"i":56},"Sender Policy Framework",{"t":62},") es un mecanismo de autenticación de correo electrónico basado en DNS que permite a los administradores de dominios declarar explícitamente qué servidores de correo están autorizados a enviar mensajes en nombre de su dominio.",{"type":50,"content":64},[65],{"t":66},"Cuando un servidor de correo receptor recibe un mensaje, consulta el registro SPF del dominio del remitente en el DNS para verificar si el servidor emisor tiene permiso para enviar desde ese dominio. Si no lo tiene, el mensaje puede ser rechazado o marcado como spam.",{"type":50,"content":68},[69,71,73,75,77],{"t":70},"SPF es uno de los tres pilares de la autenticación de correo electrónico moderno, junto con ",{"t":72,"b":56},"DKIM",{"t":74}," (DomainKeys Identified Mail) y ",{"t":76,"b":56},"DMARC",{"t":78}," (Domain-based Message Authentication, Reporting and Conformance).",{"type":80,"content":81},"quote",[82,84,86,89],{"t":83,"b":56},"Definición técnica:",{"t":85}," Un registro SPF es un registro DNS de tipo TXT publicado en la zona del dominio que lista las direcciones IP y los dominios autorizados para enviar correo electrónico en nombre de ese dominio, siguiendo la especificación definida en el ",{"t":87,"href":88},"RFC 7208","https:\u002F\u002Fdatatracker.ietf.org\u002Fdoc\u002Fhtml\u002Frfc7208",{"t":90},".",{"type":45,"content":92},[93],{"t":94},"¿Para qué sirve el registro SPF? Beneficios principales",{"type":50,"content":96},[97],{"t":98},"Implementar correctamente un registro SPF en tu dominio aporta cuatro ventajas fundamentales:",{"type":100,"items":101},"list",[102,107,112,121],[103,105],{"t":104,"b":56},"Previene la suplantación de identidad (spoofing):",{"t":106}," un atacante no podrá enviar correos haciéndose pasar por tu dominio desde servidores no autorizados.",[108,110],{"t":109,"b":56},"Mejora la entregabilidad del correo:",{"t":111}," los servidores de destino confían más en los mensajes que pasan la verificación SPF y los colocan en la bandeja de entrada, no en spam.",[113,115,117,119],{"t":114,"b":56},"Protege la reputación del dominio:",{"t":116}," evita que tu dominio aparezca en listas negras (",{"t":118,"i":56},"blacklists",{"t":120},") por envío de spam desde servidores ajenos.",[122,124],{"t":123,"b":56},"Requisito para DMARC:",{"t":125}," sin SPF correctamente configurado, no es posible implementar una política DMARC efectiva.",{"type":50,"content":127},[128,130,132,134,136],{"t":129},"En sys4net, desde que operamos el servicio de filtrado ",{"t":131,"b":56},"SendGuardian",{"t":133},", el error ",{"t":135,"code":56},"The message failed SPF checks",{"t":137}," es uno de los más frecuentes en los logs de nuestros clientes. En la mayoría de los casos, el problema es un registro SPF ausente o mal configurado en el dominio del remitente.",{"type":45,"content":139},[140],{"t":141},"¿Cómo funciona el registro SPF? Mecanismo paso a paso",{"type":50,"content":143},[144],{"t":145},"El proceso de validación SPF ocurre en tiempo real durante la recepción del mensaje:",{"type":147,"items":148},"ordered",[149,156,159,162],[150,152,154],{"t":151},"El servidor emisor envía el correo indicando el dominio del remitente (campo ",{"t":153,"code":56},"MAIL FROM",{"t":155}," del protocolo SMTP).",[157],{"t":158},"El servidor receptor extrae el dominio del remitente y realiza una consulta DNS para obtener el registro TXT con la política SPF de ese dominio.",[160],{"t":161},"El servidor receptor compara la dirección IP del servidor emisor con las IPs autorizadas en el registro SPF.",[163,165,167,169,171,173,175,177,179],{"t":164},"Según el resultado, el servidor aplica la política indicada en el registro: ",{"t":166,"b":56},"Pass",{"t":168}," (autorizado), ",{"t":170,"b":56},"Fail",{"t":172}," (rechazado), ",{"t":174,"b":56},"SoftFail",{"t":176}," (sospechoso) o ",{"t":178,"b":56},"Neutral",{"t":90},{"type":45,"content":181},[182],{"t":183},"¿Dónde se crea el registro SPF?",{"type":50,"content":185},[186,188,190],{"t":187},"El registro SPF se publica como un ",{"t":189,"b":56},"registro DNS de tipo TXT",{"t":191}," en la zona DNS del dominio. Puede gestionarse desde:",{"type":100,"items":193},[194,200],[195,196,198],{"t":53},{"t":197,"b":56},"panel de control del proveedor de hosting o registrador del dominio",{"t":199}," (cPanel, Plesk, Cloudflare, etc.).",[201],{"t":202},"El servidor DNS autorizado del dominio, si se gestiona de forma propia.",{"type":50,"content":204},[205,207,209,211,213],{"t":206},"Solo puede existir ",{"t":208,"b":56},"un único registro SPF por dominio",{"t":210},". Si necesitas autorizar múltiples orígenes, deben incluirse todos en un mismo registro usando la directiva ",{"t":212,"code":56},"include",{"t":90},{"type":45,"content":215},[216],{"t":217},"Sintaxis del registro SPF: cómo se construye",{"type":50,"content":219},[220],{"t":221},"Un registro SPF tiene la siguiente estructura general:",{"type":223,"content":224,"language":225},"code","v=spf1 [mecanismos] [modificadores] [política_final]","texto",{"type":227,"content":228},"subheading",[229],{"t":230},"Ejemplo real de registro SPF",{"type":223,"content":232,"language":225},"sys4net.com. IN TXT \"v=spf1 a mx ip4:185.14.56.5 include:sendgrid.net ~all\"",{"type":227,"content":234},[235],{"t":236},"Componentes del registro SPF",{"type":238,"cabecera":239,"filas":249},"table",[240,243,246],[241],{"t":242},"Componente",[244],{"t":245},"Descripción",[247],{"t":248},"Ejemplo",[250,259,268,277,291,301,310,323,335],[251,254,257],[252],{"t":253,"code":56},"v=spf1",[255],{"t":256},"Versión del protocolo. Obligatorio, siempre al inicio.",[258],{"t":253,"code":56},[260,263,266],[261],{"t":262,"code":56},"a",[264],{"t":265},"Autoriza la IP del registro A del dominio.",[267],{"t":262,"code":56},[269,272,275],[270],{"t":271,"code":56},"mx",[273],{"t":274},"Autoriza las IPs de los servidores MX del dominio.",[276],{"t":271,"code":56},[278,281,284],[279],{"t":280,"code":56},"ip4",[282],{"t":283},"Autoriza una dirección IPv4 o rango CIDR.",[285,287,289],{"t":286,"code":56},"ip4:185.14.56.5",{"t":288}," o ",{"t":290,"code":56},"ip4:185.14.56.0\u002F24",[292,295,298],[293],{"t":294,"code":56},"ip6",[296],{"t":297},"Autoriza una dirección IPv6 o rango.",[299],{"t":300,"code":56},"ip6:2001:db8::1",[302,304,307],[303],{"t":212,"code":56},[305],{"t":306},"Incluye la política SPF de otro dominio (útil para proveedores externos como Google Workspace, SendGrid, etc.).",[308],{"t":309,"code":56},"include:_spf.google.com",[311,314,321],[312],{"t":313,"code":56},"-all",[315,317,319],{"t":316},"Política estricta: cualquier servidor no listado recibe ",{"t":318,"b":56},"FAIL",{"t":320},". El mensaje se rechaza.",[322],{"t":313,"code":56},[324,327,333],[325],{"t":326,"code":56},"~all",[328,330,331],{"t":329},"Política suave: cualquier servidor no listado recibe ",{"t":174,"b":56},{"t":332},". El mensaje puede ir a spam.",[334],{"t":326,"code":56},[336,339,342],[337],{"t":338,"code":56},"?all",[340],{"t":341},"Política neutral: no indica preferencia. No recomendado en producción.",[343],{"t":338,"code":56},{"type":227,"content":345},[346],{"t":347},"Ejemplos de registros SPF habituales",{"type":50,"content":349},[350],{"t":351,"b":56},"Solo el servidor de correo propio (registro MX):",{"type":223,"content":353,"language":225},"v=spf1 mx -all",{"type":50,"content":355},[356],{"t":357,"b":56},"Google Workspace + servidor propio:",{"type":223,"content":359,"language":225},"v=spf1 mx include:_spf.google.com -all",{"type":50,"content":361},[362],{"t":363,"b":56},"IP específica + SendGrid + política suave:",{"type":223,"content":365,"language":225},"v=spf1 ip4:185.14.56.5 include:sendgrid.net ~all",{"type":50,"content":367},[368],{"t":369,"b":56},"Múltiples proveedores:",{"type":223,"content":371,"language":225},"v=spf1 mx ip4:185.14.56.0\u002F24 include:_spf.google.com include:amazonses.com -all",{"type":45,"content":373},[374],{"t":375},"Cómo crear un registro SPF paso a paso",{"type":147,"items":377},[378,383,388,393,404,411,419,425],[379,381],{"t":380,"b":56},"Identifica todos los servidores que envían correo desde tu dominio:",{"t":382}," servidor de correo propio, plataformas de email marketing (Mailchimp, SendGrid, Brevo), CRMs, servicios de facturación, etc.",[384,386],{"t":385,"b":56},"Accede al panel DNS de tu dominio",{"t":387}," (cPanel, Cloudflare, tu registrador de dominio, etc.).",[389,391],{"t":390,"b":56},"Crea un nuevo registro TXT",{"t":392}," con los siguientes valores:",[394,396,398,400,402],{"t":395},"– ",{"t":397,"b":56},"Nombre \u002F Host:",{"t":399}," ",{"t":401,"code":56},"@",{"t":403}," (o el nombre de tu dominio raíz)",[405,406,408,409],{"t":395},{"t":407,"b":56},"Tipo:",{"t":399},{"t":410,"code":56},"TXT",[412,413,415,417],{"t":395},{"t":414,"b":56},"Valor:",{"t":416}," tu cadena SPF, por ejemplo: ",{"t":418,"code":56},"v=spf1 mx ip4:TU_IP -all",[420,421,423],{"t":395},{"t":422,"b":56},"TTL:",{"t":424}," 3600 (recomendado)",[426,428],{"t":427,"b":56},"Guarda el registro",{"t":429}," y espera la propagación DNS (puede tardar entre minutos y 48 horas).",{"type":50,"content":431},[432],{"t":433},"Si prefieres usar un asistente, estas herramientas online generan el registro automáticamente:",{"type":100,"items":435},[436,440,444],[437],{"t":438,"href":439},"SPF Wizard (spfwizard.net)","https:\u002F\u002Fwww.spfwizard.net\u002Findex.php\u002F?lang=es",[441],{"t":442,"href":443},"SPF Generator de Dynu","https:\u002F\u002Fwww.dynu.com\u002FNetworkTools\u002FSPFGenerator",[445],{"t":446,"href":447},"SPF Wizard de Unlock The Inbox","https:\u002F\u002Fwww.unlocktheinbox.com\u002Fspfwizard\u002F",{"type":45,"content":449},[450],{"t":451},"Cómo verificar el registro SPF de un dominio",{"type":50,"content":453},[454],{"t":455},"Una vez creado el registro, es fundamental verificar que es correcto y que se ha propagado. Existen dos métodos principales:",{"type":227,"content":457},[458],{"t":459},"Verificación desde la línea de comandos",{"type":50,"content":461},[462,464,466,468],{"t":463,"b":56},"En Windows",{"t":465}," (abre CMD con Win + R → ",{"t":467,"code":56},"cmd",{"t":469},"):",{"type":223,"content":471,"language":225},"nslookup -type=txt dominio.com",{"type":50,"content":473},[474,476],{"t":475,"b":56},"En Linux \u002F macOS",{"t":477}," (terminal):",{"type":223,"content":479,"language":225},"dig txt dominio.com +short",{"type":50,"content":481},[482,484,486],{"t":483},"Busca en el resultado una línea que comience por ",{"t":485,"code":56},"\"v=spf1 ...\"",{"t":487},". Esa es tu política SPF activa.",{"type":227,"content":489},[490],{"t":491},"Verificación con herramientas online",{"type":100,"items":493},[494,498,502],[495],{"t":496,"href":497},"Validador SPF de Kitterman","https:\u002F\u002Fwww.kitterman.com\u002Fspf\u002Fvalidate.html",[499],{"t":500,"href":501},"DMARC Analyzer – SPF Lookup","https:\u002F\u002Fapp.dmarcanalyzer.com\u002Fdns\u002Fspf",[503],{"t":504,"href":505},"Validador de sintaxis SPF de Vamsoft","https:\u002F\u002Fvamsoft.com\u002Fsupport\u002Ftools\u002Fspf-syntax-validator",{"type":45,"content":507},[508],{"t":509},"Errores comunes en la configuración del registro SPF",{"type":100,"items":511},[512,517,529,534,542],[513,515],{"t":514,"b":56},"Más de un registro SPF en el mismo dominio:",{"t":516}," solo está permitido uno. Tener dos registros SPF genera resultados imprevisibles y hace que los servidores de destino descarten ambos. Combínalos siempre en uno solo.",[518,520,522,523,525,527],{"t":519,"b":56},"Superar el límite de 10 consultas DNS:",{"t":521}," el estándar SPF permite como máximo 10 consultas DNS recursivas (contando los ",{"t":212,"code":56},{"t":524},"). Si las superas, el resultado es ",{"t":526,"code":56},"PermError",{"t":528}," y tu correo puede ser rechazado.",[530,532],{"t":531,"b":56},"SPF incorrecto o desactualizado:",{"t":533}," si cambias de proveedor de hosting o de email y no actualizas el SPF, estarás denegando explícitamente tus propias IPs. Es preferible no tener SPF a tenerlo mal configurado.",[535,537,539,541],{"t":536,"b":56},"Olvidar los servicios de terceros:",{"t":538}," plataformas como Mailchimp, HubSpot, Brevo o Amazon SES también envían en tu nombre. Deben estar incluidos en tu SPF con ",{"t":540,"code":56},"include:dominio_del_proveedor",{"t":90},[543,545,547,549],{"t":544,"b":56},"Usar ",{"t":546,"b":56,"code":56},"+all",{"t":548,"b":56},":",{"t":550}," esto equivale a autorizar cualquier servidor del mundo. Nunca debe usarse en producción.",{"type":45,"content":552},[553],{"t":554},"Preguntas frecuentes sobre el registro SPF",{"type":227,"content":556},[557],{"t":558},"¿Es obligatorio tener un registro SPF?",{"type":50,"content":560},[561,563,565],{"t":562},"No es técnicamente obligatorio, pero sí ",{"t":564,"b":56},"altamente recomendado",{"t":566},". Desde febrero de 2024, Google y Yahoo exigen SPF para dominios que envíen más de 5.000 mensajes diarios. Sin SPF, la entregabilidad de tu correo se ve seriamente comprometida.",{"type":227,"content":568},[569,571,572,574,575],{"t":570},"¿Qué diferencia hay entre ",{"t":313,"code":56},{"t":573}," y ",{"t":326,"code":56},{"t":576},"?",{"type":50,"content":578},[579,580,582,584,586,587,589,591,593,594],{"t":313,"code":56},{"t":581}," (Hard Fail) hace que el servidor receptor ",{"t":583,"b":56},"rechace",{"t":585}," directamente los mensajes de servidores no autorizados. ",{"t":326,"code":56},{"t":588}," (SoftFail) los acepta pero los ",{"t":590,"b":56},"marca como sospechosos",{"t":592},", pudiendo acabar en la carpeta de spam. Para dominios de producción con su configuración bien definida, se recomienda ",{"t":313,"code":56},{"t":90},{"type":227,"content":596},[597],{"t":598},"¿El SPF solo protege el campo \"De:\" visible?",{"type":50,"content":600},[601,603,605,607,608,610,612,614,615,617,618],{"t":602},"No exactamente. SPF valida el ",{"t":604,"b":56},"envelope sender",{"t":606}," (campo ",{"t":153,"code":56},{"t":609}," del protocolo SMTP), que no siempre coincide con el campo ",{"t":611,"code":56},"From:",{"t":613}," visible en el cliente de correo. Para proteger también el ",{"t":611,"code":56},{"t":616}," visible, es necesario implementar ",{"t":76,"b":56},{"t":90},{"type":227,"content":620},[621],{"t":622},"¿Puedo autorizar varios proveedores de correo a la vez?",{"type":50,"content":624},[625,627,628,630,632],{"t":626},"Sí. Simplemente encadena los mecanismos ",{"t":212,"code":56},{"t":629}," en un único registro SPF: ",{"t":631,"code":56},"v=spf1 include:_spf.google.com include:sendgrid.net ip4:185.14.56.5 -all",{"t":633},". Recuerda no superar el límite de 10 consultas DNS.",{"type":227,"content":635},[636],{"t":637},"¿SPF funciona solo o necesita DKIM y DMARC?",{"type":50,"content":639},[640],{"t":641},"SPF funciona de forma independiente, pero su efectividad es limitada si no se combina con DKIM y DMARC. La combinación de los tres protocolos es el estándar de la industria para una autenticación de correo robusta. SPF y DKIM son los pilares; DMARC los une y permite definir qué hacer cuando alguno falla.",{"type":227,"content":643},[644],{"t":645},"¿Qué pasa si tengo el SPF mal configurado?",{"type":50,"content":647},[648],{"t":649},"Un SPF incorrecto es peor que no tener ninguno. Si el registro SPF de tu dominio lista únicamente las IPs de un proveedor antiguo, estás denegando explícitamente tus servidores actuales. Los servidores de destino interpretarán esto como un intento de spoofing y rechazarán o filtrarán tus mensajes.",{"type":227,"content":651},[652],{"t":653},"¿Cómo sé qué IPs debo incluir en mi SPF?",{"type":50,"content":655},[656,658,659],{"t":657},"Debes incluir todas las fuentes que envíen correo usando tu dominio: el servidor MX principal, cualquier IP de servidores de aplicaciones web que envíen notificaciones, y los dominios SPF de cada proveedor externo que uses (Google Workspace, Microsoft 365, plataformas de email marketing, etc.). Tu proveedor de hosting o servicio de correo te facilitará su mecanismo ",{"t":212,"code":56},{"t":660}," específico.",{"type":45,"content":662},[663],{"t":664},"SPF, DKIM y DMARC: ¿cuál es la diferencia?",{"type":238,"cabecera":666,"filas":676},[667,670,673],[668],{"t":669},"Protocolo",[671],{"t":672},"¿Qué valida?",[674],{"t":675},"¿Cómo funciona?",[677,687,696],[678,681,684],[679],{"t":680,"b":56},"SPF",[682],{"t":683},"El servidor emisor (IP)",[685],{"t":686},"Compara la IP del servidor emisor con la lista de IPs autorizadas en el DNS",[688,690,693],[689],{"t":72,"b":56},[691],{"t":692},"La integridad del mensaje",[694],{"t":695},"Firma criptográfica en las cabeceras del mensaje, verificable con clave pública en el DNS",[697,699,702],[698],{"t":76,"b":56},[700],{"t":701},"La alineación del dominio y la política de actuación",[703,705,706],{"t":704},"Verifica que SPF o DKIM se alinean con el dominio del campo ",{"t":611,"code":56},{"t":707}," y define qué hacer si no pasan",{"type":50,"content":709},[710],{"t":711},"Los tres protocolos son complementarios. SPF es el punto de partida y el más sencillo de implementar.",{"type":45,"content":713},[714],{"t":715},"¿Necesitas ayuda para configurar el SPF de tu dominio?",{"type":50,"content":717},[718,720,722,724,725],{"t":719},"En ",{"t":29,"b":56,"href":721},"https:\u002F\u002Fsys4net.com",{"t":723}," llevamos más de 20 años gestionando infraestructura de correo electrónico para empresas. 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