{"id":5795,"date":"2022-01-24T07:56:44","date_gmt":"2022-01-24T13:56:44","guid":{"rendered":"https:\/\/www.knownhost.com\/kb\/?p=5795"},"modified":"2022-08-24T06:38:46","modified_gmt":"2022-08-24T11:38:46","slug":"smtp-error-555","status":"publish","type":"post","link":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/","title":{"rendered":"SMTP Error 555"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #212121;color:#212121\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #212121;color:#212121\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/#what_does_this_mean\" >What does this mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/#how_to_fix_smtp_error_555\" >How to fix SMTP Error 555?<\/a><\/li><\/ul><\/nav><\/div>\n\n<p><strong>Description<\/strong>: MAIL FROM\/RCPT TO parameters not recognized or not implemented.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"what_does_this_mean\"><\/span>What does this mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The outgoing mail server (your server) is not properly registering the email address used in either your FROM or TO settings.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how_to_fix_smtp_error_555\"><span class=\"ez-toc-section\" id=\"how_to_fix_smtp_error_555\"><\/span>How to fix SMTP Error 555?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Check your outgoing mail parameters to ensure proper &#8220;From:&#8221; address.<\/li><li>Check the email recipient for misspelling.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Description: MAIL FROM\/RCPT TO parameters not recognized or not implemented. What does this mean? The outgoing mail server (your server) is not properly registering the email address used in either your FROM or TO settings. How to fix SMTP Error 555? Check your outgoing mail parameters to ensure proper &#8220;From:&#8221; address. Check the email recipient [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[97],"tags":[585,380,291],"class_list":["post-5795","post","type-post","status-publish","format-standard","hentry","category-other","tag-585","tag-error","tag-smtp"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SMTP Error 555 - KnownHost<\/title>\n<meta name=\"description\" content=\"KnownHost self-hosted email guide to help you troubleshoot and fix SMTP Error 555 on your premium KnownHost server.\" \/>\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.knownhost.com\/kb\/smtp-error-555\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SMTP Error 555 - KnownHost\" \/>\n<meta property=\"og:description\" content=\"KnownHost self-hosted email guide to help you troubleshoot and fix SMTP Error 555 on your premium KnownHost server.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/\" \/>\n<meta property=\"og:site_name\" content=\"KnownHost\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-24T13:56:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-08-24T11:38:46+00:00\" \/>\n<meta name=\"author\" content=\"Somesh Z\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Somesh Z\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/\"},\"author\":{\"name\":\"Somesh Z\",\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/#\\\/schema\\\/person\\\/8b518f13cf69dd00d147e577d63ff3b1\"},\"headline\":\"SMTP Error 555\",\"datePublished\":\"2022-01-24T13:56:44+00:00\",\"dateModified\":\"2022-08-24T11:38:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/\"},\"wordCount\":59,\"keywords\":[\"555\",\"error\",\"SMTP\"],\"articleSection\":[\"Other\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/\",\"url\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/\",\"name\":\"SMTP Error 555 - KnownHost\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/#website\"},\"datePublished\":\"2022-01-24T13:56:44+00:00\",\"dateModified\":\"2022-08-24T11:38:46+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/#\\\/schema\\\/person\\\/8b518f13cf69dd00d147e577d63ff3b1\"},\"description\":\"KnownHost self-hosted email guide to help you troubleshoot and fix SMTP Error 555 on your premium KnownHost server.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/smtp-error-555\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"SMTP Error 555\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/#website\",\"url\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/\",\"name\":\"KnownHost\",\"description\":\"KnownHost provides a comprehensive webhosting knowledge base to help answer many of your common webhosting and linux questions.\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.knownhost.com\\\/kb\\\/#\\\/schema\\\/person\\\/8b518f13cf69dd00d147e577d63ff3b1\",\"name\":\"Somesh Z\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/276c97317c2d6905cc5a1bd9ceb10a0fd121cc4da22126f648fa88f95dcf32dd?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/276c97317c2d6905cc5a1bd9ceb10a0fd121cc4da22126f648fa88f95dcf32dd?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/276c97317c2d6905cc5a1bd9ceb10a0fd121cc4da22126f648fa88f95dcf32dd?s=96&d=mm&r=g\",\"caption\":\"Somesh Z\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"SMTP Error 555 - KnownHost","description":"KnownHost self-hosted email guide to help you troubleshoot and fix SMTP Error 555 on your premium KnownHost server.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/","og_locale":"en_US","og_type":"article","og_title":"SMTP Error 555 - KnownHost","og_description":"KnownHost self-hosted email guide to help you troubleshoot and fix SMTP Error 555 on your premium KnownHost server.","og_url":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/","og_site_name":"KnownHost","article_published_time":"2022-01-24T13:56:44+00:00","article_modified_time":"2022-08-24T11:38:46+00:00","author":"Somesh Z","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Somesh Z","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/#article","isPartOf":{"@id":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/"},"author":{"name":"Somesh Z","@id":"https:\/\/www.knownhost.com\/kb\/#\/schema\/person\/8b518f13cf69dd00d147e577d63ff3b1"},"headline":"SMTP Error 555","datePublished":"2022-01-24T13:56:44+00:00","dateModified":"2022-08-24T11:38:46+00:00","mainEntityOfPage":{"@id":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/"},"wordCount":59,"keywords":["555","error","SMTP"],"articleSection":["Other"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/","url":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/","name":"SMTP Error 555 - KnownHost","isPartOf":{"@id":"https:\/\/www.knownhost.com\/kb\/#website"},"datePublished":"2022-01-24T13:56:44+00:00","dateModified":"2022-08-24T11:38:46+00:00","author":{"@id":"https:\/\/www.knownhost.com\/kb\/#\/schema\/person\/8b518f13cf69dd00d147e577d63ff3b1"},"description":"KnownHost self-hosted email guide to help you troubleshoot and fix SMTP Error 555 on your premium KnownHost server.","breadcrumb":{"@id":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.knownhost.com\/kb\/smtp-error-555\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.knownhost.com\/kb\/smtp-error-555\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.knownhost.com\/kb\/"},{"@type":"ListItem","position":2,"name":"SMTP Error 555"}]},{"@type":"WebSite","@id":"https:\/\/www.knownhost.com\/kb\/#website","url":"https:\/\/www.knownhost.com\/kb\/","name":"KnownHost","description":"KnownHost provides a comprehensive webhosting knowledge base to help answer many of your common webhosting and linux questions.","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.knownhost.com\/kb\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.knownhost.com\/kb\/#\/schema\/person\/8b518f13cf69dd00d147e577d63ff3b1","name":"Somesh Z","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/276c97317c2d6905cc5a1bd9ceb10a0fd121cc4da22126f648fa88f95dcf32dd?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/276c97317c2d6905cc5a1bd9ceb10a0fd121cc4da22126f648fa88f95dcf32dd?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/276c97317c2d6905cc5a1bd9ceb10a0fd121cc4da22126f648fa88f95dcf32dd?s=96&d=mm&r=g","caption":"Somesh Z"}}]}},"_links":{"self":[{"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/posts\/5795","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/comments?post=5795"}],"version-history":[{"count":0,"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/posts\/5795\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/media?parent=5795"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/categories?post=5795"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.knownhost.com\/kb\/wp-json\/wp\/v2\/tags?post=5795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}