{"id":139,"date":"2024-07-25T08:11:10","date_gmt":"2024-07-25T08:11:10","guid":{"rendered":"https:\/\/azamedia.com\/kb\/?post_type=docs&#038;p=139"},"modified":"2026-09-15T20:23:24","modified_gmt":"2026-09-15T20:23:24","password":"","slug":"503-this-mail-server-requires-authentication-please-check-your-mail-client-settings","status":"publish","type":"docs","link":"https:\/\/azamedia.com\/kb\/docs\/503-this-mail-server-requires-authentication-please-check-your-mail-client-settings\/","title":{"rendered":"Error 503: el servidor de correo requiere autenticaci\u00f3n SMTP"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">El error <strong>503 \u2013 This mail server requires authentication<\/strong> aparece cuando el servidor de correo saliente (SMTP) exige autenticaci\u00f3n y el programa de correo intenta enviar mensajes sin identificarse correctamente.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u00e9 debes revisar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Comprueba la configuraci\u00f3n de la cuenta en el programa de correo que utilices, por ejemplo Outlook, Thunderbird, Apple Mail u otro cliente compatible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En la configuraci\u00f3n del <strong>servidor de correo saliente (SMTP)<\/strong> verifica que:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La opci\u00f3n <strong>El servidor de salida requiere autenticaci\u00f3n<\/strong> est\u00e9 activada.<\/li>\n\n\n\n<li>Se utilicen el <strong>mismo usuario y contrase\u00f1a que para el correo entrante<\/strong>, salvo que AZAMedia te haya indicado unas credenciales diferentes.<\/li>\n\n\n\n<li>El nombre de usuario sea normalmente la <strong>direcci\u00f3n de correo completa<\/strong>, por ejemplo <code>usuario@tudominio.com<\/code>.<\/li>\n\n\n\n<li>La contrase\u00f1a configurada sea la contrase\u00f1a actual del buz\u00f3n.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Puertos habituales del servidor SMTP<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La configuraci\u00f3n exacta puede variar seg\u00fan el servicio, pero normalmente el env\u00edo autenticado utiliza uno de estos m\u00e9todos:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Puerto 587 con STARTTLS<\/strong>, opci\u00f3n recomendada cuando est\u00e9 disponible.<\/li>\n\n\n\n<li><strong>Puerto 465 con SSL\/TLS<\/strong>, si la configuraci\u00f3n del servicio lo requiere.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Evita utilizar el puerto 25 para configurar un cliente de correo salvo que se haya indicado expresamente, ya que muchos proveedores de acceso a Internet lo bloquean o restringen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Si sigues recibiendo el error<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Si la autenticaci\u00f3n SMTP est\u00e1 activada y el error contin\u00faa:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Comprueba que puedes acceder al buz\u00f3n mediante Webmail con el mismo usuario y contrase\u00f1a.<\/li>\n\n\n\n<li>Revisa que no haya espacios adicionales o errores al escribir el nombre de usuario.<\/li>\n\n\n\n<li>Vuelve a introducir la contrase\u00f1a de la cuenta en el cliente de correo.<\/li>\n\n\n\n<li>Comprueba que el tipo de cifrado y el puerto coinciden con la configuraci\u00f3n indicada para tu servicio.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Si el problema persiste, contacta con el soporte de AZAMedia indicando la direcci\u00f3n de correo afectada, el programa de correo que utilizas y, si es posible, una captura de la configuraci\u00f3n del servidor entrante y saliente <strong>sin mostrar la contrase\u00f1a<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Qu\u00e9 significa el error 503 de autenticaci\u00f3n SMTP y c\u00f3mo revisar la configuraci\u00f3n del servidor de correo saliente en Outlook, Thunderbird, Apple Mail y otros clientes de correo.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[16,15],"doc_tag":[],"class_list":["post-139","docs","type-docs","status-publish","hentry","doc_category-codigos-de-error","doc_category-correo"],"year_month":"2026-09","word_count":329,"total_views":"1002","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"admin","author_nicename":"rellenar_ar9n7pta","author_url":"https:\/\/azamedia.com\/kb\/author\/rellenar_ar9n7pta\/"},"doc_category_info":[{"term_name":"C\u00f3digos de Error","term_url":"https:\/\/azamedia.com\/kb\/docs-category\/codigos-de-error\/"},{"term_name":"Correo","term_url":"https:\/\/azamedia.com\/kb\/docs-category\/correo\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - 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