{"id":2222,"date":"2018-08-28T12:27:09","date_gmt":"2018-08-28T12:27:09","guid":{"rendered":"https:\/\/www.kerneldatarecovery.com\/blog\/?p=2222"},"modified":"2021-03-23T11:58:00","modified_gmt":"2021-03-23T11:58:00","slug":"how-to-fix-exchange-smtp-error-550-unable-to-relay","status":"publish","type":"post","link":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/","title":{"rendered":"How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?"},"content":{"rendered":"<p>SMTP stands for Simple Mail Transfer Protocol that works to send emails between the server and its email clients. It works the same in the Exchange Server and is used for communication between the Exchange Server and its client. However, sometimes, you will face some issues like 550 5.7.1 error code displaying \u201cUnable to relay\u201d while trying to send emails through SMTP. Let us find out what is Exchange SMTP error 550 5.7.1 and then ways to fix this to get back emails accessibility hindered before.<\/p>\n<h4>What is Error SMTP error 550 5.7.1?<\/h4>\n<p>The SMTP error 550 5.7.1 occurs in In Exchange 2016, 2013, 2010, or 2007 versions while users trying to send emails. If Exchange finds that any unauthorized user is accessing the Exchange Server, then it will display SMTP error 550 5.7.1 with the error message \u201cUnable to relay.\u201d<\/p>\n<p>This error can happen to any user and can block emails from being sent. This error consists of three-digit codes, and each digit has a meaning.<\/p>\n<h4>What are the causes of SMTP error 550 5.7.1?<\/h4>\n<p>There are some factors that are responsible for this error like:<\/p>\n<ul>\n<li>There is an unknown sender, or the Outgoing Mail Server does not recognize the sender.<\/li>\n<li>Sender domain fails to be authenticated<\/li>\n<li>The recipient policy of the receiver domain blocks emails from the sender domain.<\/li>\n<\/ul>\n<h4>How to fix 550 5.7.1 error unable to relay in Exchange Server<\/h4>\n<ol>\n<li>Launch <strong>Exchange Server Manager<\/strong> and move to <strong>Administrative Groups<\/strong>.<\/li>\n<li>Select <strong>Administrative Group Name<\/strong> then choose <strong>Server&gt;Server Name<\/strong>.<\/li>\n<li>Now click on <strong>Protocols<\/strong> and Select <strong>SMTP<\/strong>.<\/li>\n<li>Right-click on Default SMTP Virtual Server and select <strong>Properties<\/strong><\/li>\n<li>In Access tab, click on <strong>Relay&gt;only<\/strong> the list below<\/li>\n<li>Now check the checkbox \u201c<strong>Allow all systems to successfully authenticate to relay regardless of the list above<\/strong>\u201d and close.<\/li>\n<\/ol>\n<p>Now you can send messages as normal.<\/p>\n<h4>What to do if you are not able to send messages because of EDB corruption?<\/h4>\n<p>Exchange Server Recovery software helps you in repairing your corrupted EDB files.<\/p>\n<p>Sometimes users will find that mailboxes are inaccessible due to damaged EDB files. So, repair your EDB files with this fully automated tool. With this comprehensive <a href=\"https:\/\/www.kerneldatarecovery.com\/exchange-server-recovery.html\">Exchange Server Recovery tool<\/a>, you can migrate your repaired EDB files to Live Exchange or Office 365. It has options to migrate mailboxes from Live Exchange to Office 365 and vice versa. The software works with all versions of MS Exchange Server and Windows OS, and all plans of Office 365.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/08\/exchange-server.png\" alt=\"\" class=\"alignnone size-full wp-image-2223\" width=\"1201\" height=\"624\" srcset=\"https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/08\/exchange-server.png 1201w, https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/08\/exchange-server-300x156.png 300w, https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/08\/exchange-server-768x399.png 768w, https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/08\/exchange-server-1024x532.png 1024w\" sizes=\"(max-width: 1201px) 100vw, 1201px\" \/><\/p>\n<p align=\"center\">\n<p align=\"center\"><a class=\"dl\" href=\"https:\/\/www.kerneldatarecovery.com\/dl\/dl.php?id=79\" onclick=\"dataLayer.push({'event': 'TrackEvent', 'eventCategory': 'Download', 'eventAction': 'ExchangeRecovery', 'eventLabel': 'BlogDLid=79'});\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-1659 noshadow\" src=\"https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/06\/dl-btn-new.png\" alt=\"Download Free\" width=\"160\" height=\"49\"><\/a><\/p>\n<h4>Conclusion<\/h4>\n<p>Exchange SMTP error blocks sending and receiving emails from server to client due to unknown sender, incorrect authentication, or recipient policy based on which a manual solution via Exchange Server Manager is explained. Inability to access Exchange data can also occur due to corruption in the database file and so, a trusted professional Exchange Recovery tool is suggested for the Exchange users.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SMTP stands for Simple Mail Transfer Protocol that works to send emails between the server and its email clients. It works the same in the Exchange Server and is used for communication between the Exchange Server and its client. However, sometimes, you will face some issues like 550 5.7.1 error code displaying \u201cUnable to relay\u201d [&hellip;]<\/p>\n","protected":false},"author":38,"featured_media":2227,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_stopmodifiedupdate":true,"_modified_date":""},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.10 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?<\/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.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?\" \/>\n<meta property=\"og:description\" content=\"SMTP stands for Simple Mail Transfer Protocol that works to send emails between the server and its email clients. It works the same in the Exchange Server and is used for communication between the Exchange Server and its client. However, sometimes, you will face some issues like 550 5.7.1 error code displaying \u201cUnable to relay\u201d [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/\" \/>\n<meta property=\"og:site_name\" content=\"Data Recovery Blog - KDR Tools\" \/>\n<meta property=\"article:published_time\" content=\"2018-08-28T12:27:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-03-23T11:58:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/08\/How-to-fix-Exchange-SMTP-Error-550-5.7.1-Unable-to-Relay.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1142\" \/>\n\t<meta property=\"og:image:height\" content=\"500\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Abhishek Pandey\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Abhishek Pandey\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?","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.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/","og_locale":"en_US","og_type":"article","og_title":"How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?","og_description":"SMTP stands for Simple Mail Transfer Protocol that works to send emails between the server and its email clients. It works the same in the Exchange Server and is used for communication between the Exchange Server and its client. However, sometimes, you will face some issues like 550 5.7.1 error code displaying \u201cUnable to relay\u201d [&hellip;]","og_url":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/","og_site_name":"Data Recovery Blog - KDR Tools","article_published_time":"2018-08-28T12:27:09+00:00","article_modified_time":"2021-03-23T11:58:00+00:00","og_image":[{"width":1142,"height":500,"url":"https:\/\/www.kerneldatarecovery.com\/blog\/wp-content\/uploads\/2018\/08\/How-to-fix-Exchange-SMTP-Error-550-5.7.1-Unable-to-Relay.jpg","type":"image\/jpeg"}],"author":"Abhishek Pandey","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Abhishek Pandey","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/#article","isPartOf":{"@id":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/"},"author":{"name":"Abhishek Pandey","@id":"https:\/\/www.kerneldatarecovery.com\/blog\/#\/schema\/person\/cb6e0eb0babd39890f042ad5bc524ae7"},"headline":"How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?","datePublished":"2018-08-28T12:27:09+00:00","dateModified":"2021-03-23T11:58:00+00:00","mainEntityOfPage":{"@id":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/"},"wordCount":460,"commentCount":0,"publisher":{"@id":"https:\/\/www.kerneldatarecovery.com\/blog\/#organization"},"articleSection":["Email Recovery"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/","url":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/","name":"How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?","isPartOf":{"@id":"https:\/\/www.kerneldatarecovery.com\/blog\/#website"},"datePublished":"2018-08-28T12:27:09+00:00","dateModified":"2021-03-23T11:58:00+00:00","breadcrumb":{"@id":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.kerneldatarecovery.com\/blog\/how-to-fix-exchange-smtp-error-550-unable-to-relay\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.kerneldatarecovery.com\/blog\/"},{"@type":"ListItem","position":2,"name":"How\u00a0to fix Exchange SMTP Error 550 5.7.1 Unable to Relay?"}]},{"@type":"WebSite","@id":"https:\/\/www.kerneldatarecovery.com\/blog\/#website","url":"https:\/\/www.kerneldatarecovery.com\/blog\/","name":"Data Recovery Blog - 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