{"id":36572,"date":"2025-11-12T10:27:00","date_gmt":"2025-11-12T10:27:00","guid":{"rendered":"https:\/\/www.bancomail.com\/blog\/?p=36572"},"modified":"2026-03-19T10:24:21","modified_gmt":"2026-03-19T10:24:21","slug":"validacion-email-b2b-servidor-smtp","status":"publish","type":"post","link":"https:\/\/www.bancomail.com\/blog\/es\/validacion-email-b2b-servidor-smtp\/","title":{"rendered":"Validaci\u00f3n de emails B2B: qu\u00e9 ocurre al consultar un servidor SMTP"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u00ab \u00a1Paaaaatxi! \u2013 As\u00ed suena nuestro Validador de Correos \u00bb<\/p>\n<\/blockquote>\n\n\n\n<p>Durante los \u00faltimos meses, uno de los retos t\u00e9cnicos m\u00e1s complejos que hemos afrontado ha sido desarrollar nuestro propio <strong><a href=\"https:\/\/www.bancomail.com\/blog\/es\/tecnologia-y-datos-la-esencia-del-negocio-de-bancomail\/\">Validador de Correos Electr\u00f3nicos<\/a><\/strong> \u2014 para que nuestra base de datos sea m\u00e1s fiable que nunca.<\/p>\n\n\n\n<p>Por supuesto, llevamos tiempo validando direcciones (vender bases de datos B2B sin comprobar los e\u2011mails es una imprudencia que puede meter a los compradores en serios problemas de <strong>blacklist<\/strong>). Siempre aseg\u00farate de que los correos sean v\u00e1lidos.<\/p>\n\n\n\n<p>Hasta ahora, nos apoy\u00e1bamos en herramientas ya existentes. Hay muchas, algunas muy buenas, y desarrollamos incluso excelentes colaboraciones con algunas de ellas.<br>Pero \u00faltimamente notamos ciertas incoherencias e inexactitudes que nos impulsaron a invertir tanto <strong>intelecto como presupuesto<\/strong> para crear una herramienta moderna, segura y funcional que nos proporcione respuestas s\u00f3lidas.<\/p>\n\n\n\n<p>Para desarrollar algo as\u00ed hay que <strong>meterse en faena<\/strong>.<br>No vale quedarse en la superficie: hay que explorar los mecanismos complejos de los servidores y los protocolos de correo\u2026 \u00a1sin perderse!<br>En el coraz\u00f3n de la validaci\u00f3n est\u00e1 ese di\u00e1logo crucial con el servidor del destinatario. Y para explicarlo de forma sencilla, usamos una analog\u00eda que muchos en Espa\u00f1a reconocer\u00e1n gracias a la campa\u00f1a \u201cPaaaaatxi!\u201d de Euskaltel.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Publicidad Euskaltel, \u00a1Patxi! 2001\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/ROV13hR_4Po?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>Porque validar un e\u2011mail es un poco como asomarse al balc\u00f3n y gritar \u201c\u00a1Paaaaatxi!\u201d\u2026<br>-&gt; Esperas una respuesta. A veces te contestan. A veces nada. Y otras\u2026 la respuesta es sorprendente.<\/p>\n\n\n\n<p>Y eso es justo lo que hace nuestro Validador de Correos: \u201cllama\u201d al dominio, escucha la respuesta, y seg\u00fan lo que obtenga, averigua qu\u00e9 hay detr\u00e1s de la direcci\u00f3n.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Caso\u202f1: MX faltante<\/strong><\/p>\n\n\n\n<p>Llegas al edificio, listo para pulsar el interfono\u2026 pero <strong>no hay interfono<\/strong>.<br>Quiz\u00e1s lo hubo antes, pero ahora\u2026 nada.<br>Te vas prometiendo volver otro d\u00eda para ver si lo han instalado.<\/p>\n\n\n\n<p><strong>Caso\u202f2: Correo temporal \/ desechable<\/strong><\/p>\n\n\n\n<p>Gritas: \u201c\u00bfPatxi est\u00e1?\u201d<br>Una voz robotizada responde: \u201c\u00a1S\u00ed, claro!\u201d<br>No est\u00e1s convencido. Te vas, y probablemente no vuelves \u2014 aunque apuntas la direcci\u00f3n.<\/p>\n\n\n\n<p><strong>Caso\u202f3: Catch\u2011all (servidores que aceptan todo)<\/strong><\/p>\n\n\n\n<p>Gritas: \u201c\u00bfPaqui est\u00e1?\u201d<br>\u2013 \u201c\u00a1S\u00ed!\u201d<br>Gritas para Iker:<br>\u2013 \u201c\u00a1Tambi\u00e9n \u00e9l!\u201d<br>Ane?<br>\u2013 \u201c\u00a1Claro que s\u00ed!\u201d<br>Jon?<br>\u2013 \u201c\u00a1Todos est\u00e1n!\u201d<br>Sonr\u00edes y te vas: si dicen \u201cs\u00ed\u201d para todos, es que mienten\u2026 para divertirse.<\/p>\n\n\n\n<p><strong>Caso\u202f4: Grey\u00adlisting<\/strong><\/p>\n\n\n\n<p>\u201c\u00bfPatxi?\u201d<br>\u2013 \u201cNo estoy seguro\u2026 vuelve en 15\u202fminutos.\u201d<br>Vuelves m\u00e1s tarde, con la esperanza de que Patxi haya aparecido.<\/p>\n\n\n\n<p><strong>Caso\u202f5: Timeout<\/strong><\/p>\n\n\n\n<p>Gritas. Silencio.<br>Quiz\u00e1s est\u00e9n durmiendo, la l\u00ednea est\u00e9 ca\u00edda, o el interfono est\u00e9 estropeado.<br>Volver\u00e1s otro d\u00eda.<\/p>\n\n\n\n<p><strong>Caso\u202f6: Emisor rechazado (Sender rejected)<\/strong><\/p>\n\n\n\n<p>Te presentas: \u201cHola, soy Andrea de Bancomail\u2026\u201d<br>\u2013 \u201cNo, gracias, no necesitamos nada.\u201d<br>Fin de la conversaci\u00f3n. Quiz\u00e1s vuelvas alg\u00fan d\u00eda\u2026 bajo otro nombre.<\/p>\n\n\n\n<p><strong>Caso\u202f7: SMTP rechazado<\/strong><\/p>\n\n\n\n<p>Gritas: \u201c\u00bfPaqui?\u201d<br>\u2013 \u201c\u00bfPaqui qui\u00e9n?\u201d<br>Explicas: \u201cPaqui Rodr\u00edguez\u2026\u201d<br>\u2013 \u201cNo est\u00e1 registrada aqu\u00ed. Nunca hemos o\u00eddo hablar de ella.\u201d<br>Te quedas un poco desconcertado, pero aprecias la sinceridad.<br><em>&#8220;\u00a1Paaaatchi\u2026 bueno, al menos fueron honestos!&#8221;<\/em><\/p>\n\n\n\n<p><strong>Caso\u202f8: Correo v\u00e1lido<\/strong><\/p>\n\n\n\n<p>Gritas: \u201c\u00bfJon?\u201d<br>\u2013 \u201c\u00a1S\u00ed, soy yo!\u201d<br>Respondieron sinceramente. Preguntaste por otros tambi\u00e9n, y fueron honestos.<br>Te vas tranquilo \u2014 al fin, una respuesta real.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>En resumen:<\/strong><br>Validar correos es b\u00e1sicamente un recorrido por <strong>interfonos digitales<\/strong> \u2014 unos no est\u00e1n, otros fingen, unos dudan, otros ni contestan\u2026 y de vez en cuando, alguien responde.<br>Nosotros lo hacemos miles de veces al d\u00eda, educados, puntuales, y con un algoritmo que nunca falla.<br>Porque incluso en el mundo digital, sigue vigente la regla del edificio de pisos:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Si nadie abre, no insistas.<\/li>\n\n\n\n<li>Pero si todos abren con demasiada alegr\u00eda\u2026 quiz\u00e1s sea motivo de sospecha.<\/li>\n<\/ul>\n\n\n\n<p><strong>PD:<\/strong><br>Gracias a quienes han le\u00eddo hasta el final \u2014 con la intenci\u00f3n de arrancar una sonrisa en un tema que a primera vista suele parecer serio.<br>Y gracias a \u201cPatxi\u201d, aquel grito ic\u00f3nico que ahora usamos como met\u00e1fora de nuestro \u201cring\u2011ring\u201d al dominio.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Verificar un email significa interrogar a los servidores del dominio y analizar las respuestas SMTP para identificar direcciones v\u00e1lidas, inexistentes o de riesgo (catch-all, disposable, greylisting). Bancomail ejecuta estos controles a gran escala cada d\u00eda, filtrando casos como MX inexistente o rechazo del remitente para reducir rebotes y riesgos de blacklist. Si un servidor no responde o acepta todo, el dato no es fiable.<\/p>\n","protected":false},"author":6,"featured_media":36565,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1255],"tags":[7987,7985,7993,7977,7991,7980,7975,7979,7978,7986],"post_template":[],"top_category":[],"class_list":["post-36572","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-deliverability-capacidad-de-entrega-del-correo-electronico","tag-bases-de-datos-b2b-verificadas","tag-calidad-de-datos-b2b","tag-datos-fiables-para-campanas-b2b","tag-herramienta-validacion-email-bancomail","tag-limpieza-de-listas-de-correo","tag-prevencion-de-blacklist-email-marketing","tag-validacion-de-emails-b2b","tag-validador-de-correos-electronicos-b2b","tag-vender-bases-de-datos-de-emails","tag-verificacion-smtp-b2b"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Validaci\u00f3n de emails B2B: qu\u00e9 ocurre al consultar un servidor SMTP - Bancomail Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bancomail.com\/blog\/es\/validacion-email-b2b-servidor-smtp\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Validaci\u00f3n de emails B2B: qu\u00e9 ocurre al consultar un servidor SMTP - Bancomail Blog\" \/>\n<meta property=\"og:description\" content=\"Verificar un email significa interrogar a los servidores del dominio y analizar las respuestas SMTP para identificar direcciones v\u00e1lidas, inexistentes o de riesgo (catch-all, disposable, greylisting). 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Convinced of the importance of technical training in sales, he developed a passion for programming and specialized in database engineering. In 2001, he founded Neosoft and, combining his technical and commercial expertise, created the first European e-commerce prototype dedicated to B2B data, launching it under the Bancomail brand. 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