{"id":890,"date":"2021-07-13T06:20:55","date_gmt":"2021-07-13T11:20:55","guid":{"rendered":"https:\/\/www.knownhost.com\/kb\/?p=890"},"modified":"2022-08-19T11:08:52","modified_gmt":"2022-08-19T16:08:52","slug":"understanding-smtp-response-numbers","status":"publish","type":"post","link":"https:\/\/www.knownhost.com\/kb\/understanding-smtp-response-numbers\/","title":{"rendered":"Understanding SMTP Response Numbers"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 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\/understanding-smtp-response-numbers\/#first_digit_of_smtp_errors_1xx\" >First Digit of SMTP Errors: (1XX)<\/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\/understanding-smtp-response-numbers\/#second_digit_of_smtp_errors_x1x\" >Second Digit of SMTP Errors: (X1X)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.knownhost.com\/kb\/understanding-smtp-response-numbers\/#third_digit_of_smtp_errors_xx1\" >Third Digit of SMTP Errors: (XX1)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.knownhost.com\/kb\/understanding-smtp-response-numbers\/#example_of_smtp_errorsresponses\" >Example of SMTP Errors\/Responses<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>Earlier, we have gone through the <a href=\"https:\/\/www.knownhost.com\/kb\/email-smtp-response-and-error-numbers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Email \/ SMTP Response and Error Numbers<\/a> article, in which we have mentioned a list of SMTP errors\/responses with their possible resolution. Going through the SMTP errors\/responses, you might face a problem understanding the numeric SMTP Error (SMTP ERROR 451, SMTP ERROR 552, etc.). This article will provide you with in-detail instructions on understanding the numeric SMTP Errors\/Responses on your own. From now on, you don&#8217;t need an expert to get a clear idea of what went wrong with your failed email or so. Let&#8217;s learn to understand SMTP Response Numbers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>Standard SMTP errors\/responses consist of 3 digits (Example: 451, 552). Every Digit has a number between 1 to 5, and each number represents meaning with respect to its position. Below, we will go through each Digit and will explain the meaning,<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"first_digit_of_smtp_errors_1xx\"><\/span>First Digit of SMTP Errors: (1XX)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>The first generally tell whether the server accepted the command and if it could handle it.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Digit<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\"><strong>Explanation<\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">1<\/td><td class=\"has-text-align-left\" data-align=\"left\">The server has accepted the command but does not yet take action. A confirmation message is required. Currently, this is not used.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">2<\/td><td class=\"has-text-align-left\" data-align=\"left\">The server has completed the task successfully.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">3<\/td><td class=\"has-text-align-left\" data-align=\"left\">The server has understood the request but requires further information to complete it.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">4<\/td><td class=\"has-text-align-left\" data-align=\"left\">The server has encountered a temporary failure. If the command is repeated without any change, it might be completed. Mail servers can use such temporary failures to keep untrusted senders at bay.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">5<\/td><td class=\"has-text-align-left\" data-align=\"left\">The server has encountered an error.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"second_digit_of_smtp_errors_x1x\"><\/span>Second Digit of SMTP Errors: (X1X)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>The second number gives more information.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Digit<\/strong><\/td><td><strong>Explanation<\/strong><\/td><\/tr><tr><td>0<\/td><td>A syntax error has occurred.<\/td><\/tr><tr><td>1<\/td><td>Indicates an informational reply, for example to a HELP request.<\/td><\/tr><tr><td>2<\/td><td>Refers to the connection status.<\/td><\/tr><tr><td>3<\/td><td><em>Unspecified<\/em><\/td><\/tr><tr><td>4<\/td><td><em>Unspecified<\/em><\/td><\/tr><tr><td>5<\/td><td>Refers to the status of the mail system as a whole and the mail server in particular.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"third_digit_of_smtp_errors_xx1\"><\/span>Third Digit of SMTP Errors: (XX1)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong><strong>The third number gives a more specific description of the error and can be referenced from&nbsp;<a href=\"https:\/\/www.knownhost.com\/kb\/email-smtp-response-and-error-numbers\/\">Email \/ SMTP Response and Error Numbers<\/a><\/strong><\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"example_of_smtp_errorsresponses\"><\/span>Example of SMTP Errors\/Responses<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Following SMTP Errors\/Responses ranges between 500-504 most caused due to a broken email client or doesn&#8217;t delivery the email due to one of the following reasons,<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong><span class=\"has-inline-color has-vivid-red-color\">SMTP ERROR\/RESPONSE CODE<\/span><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong><span class=\"has-inline-color has-vivid-red-color\">MEANING<\/span><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>500<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">The server could not recognize the command due to a syntax error.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>501<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">The server could not recognize the command due to a syntax error.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>501<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">A syntax error was encountered in command arguments.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>502<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">This command is not implemented.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>503<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">The server has encountered a bad sequence of commands.<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>504<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">A command parameter is not implemented.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Earlier, we have gone through the Email \/ SMTP Response and Error Numbers article, in which we have mentioned a list of SMTP errors\/responses with their possible resolution. Going through the SMTP errors\/responses, you might face a problem understanding the numeric SMTP Error (SMTP ERROR 451, SMTP ERROR 552, etc.). This article will provide you [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-890","post","type-post","status-publish","format-standard","hentry","category-getting-started"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Understanding SMTP Response Numbers - KnownHost<\/title>\n<meta name=\"description\" content=\"Understand, troubleshoot the SMTP errors \/ responses from your own side. 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