{"id":93521,"date":"2022-01-17T12:41:49","date_gmt":"2022-01-17T12:41:49","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=93521"},"modified":"2025-08-25T12:01:10","modified_gmt":"2025-08-25T12:01:10","slug":"fix-outlook-error-code-3253-macos","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/fix-outlook-error-code-3253-macos\/","title":{"rendered":"Why are You Facing Outlook Error Code 3253 on Mac OS, and How to fix it?"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><p>Users of Mac Outlook have recently reported receiving an <strong>error code 3253<\/strong>. The error comes up with a message, &ldquo;<em>Connection to the Outlook Server had either failed or dropped&rdquo;<\/em>. This error occurs while attempting to send an email. This prevents Mac users from sending new emails, but it does not affect receiving messages.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><a href=\"https:\/\/cloud.stellarinfo.com\/StellarConverterforOLM.exe\"><img loading=\"lazy\" decoding=\"async\" width=\"226\" height=\"62\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Microsoft-vs-bing-1.png\" alt=\"Free Download for Windows\" class=\"wp-image-166355 apply-gradient-on-post-images\" style=\"width:252px;height:auto\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Microsoft-vs-bing-1.png 226w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Microsoft-vs-bing-1-150x41.png 150w\" sizes=\"auto, (max-width: 226px) 100vw, 226px\" \/><\/a><\/figure>\n<\/div><p>After clicking on send, the email message moves to the Outbox folder with a pending status and code error 3253. The worst thing is this error occurs suddenly without providing any previous notification. This might cause a significant hindrance in email communication and impact your daily work and business. So, it is necessary to fix this error as soon as possible.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"754\" height=\"399\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/Outlook-Error-Code-3253.png\" alt=\"Outlook Error Code 3253\" class=\"wp-image-93525 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/Outlook-Error-Code-3253.png 754w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/Outlook-Error-Code-3253-300x159.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/Outlook-Error-Code-3253-380x201.png 380w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/Outlook-Error-Code-3253-550x291.png 550w\" sizes=\"auto, (max-width: 754px) 100vw, 754px\" \/><\/figure><h2 class=\"wp-block-heading\" id=\"why-outlook-mac-displays-error-code&#8239;3253-(connection-failed)\">Why Outlook Mac Displays Error Code&#8239;3253 (Connection Failed)<\/h2><p>The error 3253 indicates a failure of connection to the server. The issue may occur due to various reasons. However, based on a few hypothetical scenarios of investigation done into many cases, the following are some prevalent causes:<\/p><h3 class=\"wp-block-heading\" id=\"h-outlook-account-incorrectly-set-up\"><strong>Fix 1: Verify and Correct IMAP\/SMTP Server Settings<\/strong><\/h3><p>The Outlook Error Code 3253 frequently occurs when an Outlook account is not correctly configured on the Mac machine. Outgoing (SMTP) and incoming (POP and IMAP) mail server ports are incorrectly configured. It could also be caused by incorrect server settings for the incoming and outgoing server ports.<\/p><h3 class=\"wp-block-heading\" id=\"h-the-size-of-the-sent-folder-has-been-increased\"><strong>Fix 2: Reduce Sent Mail Volume to Improve Outgoing Performance<\/strong><\/h3><p>One of the most common reasons is the large volume\/number of emails contained in the Sent folder. When the number of items in the Sent folder is increased, it puts additional strain on the email client.<\/p><h3 class=\"wp-block-heading\" id=\"h-incorrectly-installed-outlook\"><strong>Fix 3: Reinstall Outlook on Mac to Resolve 3253 Error<\/strong><\/h3><p>In some circumstances, incorrect Outlook installation on the user&rsquo;s Mac machine can cause the Mac Outlook error 3253.<\/p><h2 class=\"wp-block-heading\" id=\"how-to-fix-outlook-error-3253-on-mac-&ndash;-step&#8209;by&#8209;step\">How to Fix Outlook Error 3253 on Mac &ndash; Step&#8209;by&#8209;Step<\/h2><p>You can simply resolve the Outlook 3253 error on Mac OS by following the methods mentioned below. The methods here are provided in simple and easy-to-understand language.<\/p><p>So, first determine the Outlook account&rsquo;s connectivity. This can be POP3, IMAP, or MS Exchange Server. Following these instructions will help you locate it quickly:<\/p><ol style=\"list-style-type:1\" class=\"wp-block-list\">\n<li>Select Files &gt;&gt; Info from the dropdown menu.<\/li>\n\n\n\n<li>Go to Account Settings &gt;&gt; Select Account Settings from the dropdown menu.<\/li>\n<\/ol><h3 class=\"wp-block-heading\" id=\"h-delete-mac-outlook-s-previous-cache-storage\">Fix 1: Reset Outlook Preferences via Terminal (Clear Cache)<\/h3><p>To resolve this Mac Outlook problem, you can reset the &ldquo;<strong>cache preference<\/strong>.&rdquo; In many circumstances, this technique resolves the issue. You can manually erase unnecessary cache by following these simple steps:<\/p><ol style=\"list-style-type:1\" class=\"wp-block-list\">\n<li>Open the <em>Terminal app<\/em> by clicking the <em>Spotlight Search Glass on the Mac device. <\/em>This option is located in the upper right corner of the device screen.<\/li>\n\n\n\n<li>Then click Type Terminal. A terminal window will appear.<\/li>\n\n\n\n<li>In the Terminal, type defaults delete com.Microsoft.Outlook.<\/li>\n<\/ol><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"531\" height=\"56\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/macos-terminal-command.png\" alt=\"macos terminal\" class=\"wp-image-93526 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/macos-terminal-command.png 531w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/macos-terminal-command-300x32.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/macos-terminal-command-380x40.png 380w\" sizes=\"auto, (max-width: 531px) 100vw, 531px\" \/><\/figure><p>4. All of the existing Outlook preferences will be deleted due to this action.<\/p><p>5. In the Terminal window, type &ldquo;<strong>killall cfprefsd<\/strong>.&rdquo;<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"361\" height=\"34\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/killall-outlook-preferences.png\" alt=\"kill all Outlook preferences\" class=\"wp-image-93527 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/killall-outlook-preferences.png 361w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/01\/killall-outlook-preferences-300x28.png 300w\" sizes=\"auto, (max-width: 361px) 100vw, 361px\" \/><\/figure><p>6. The cached preferences will be deleted as a result of this action.<\/p><p>7. After that, open Outlook and send an email to see whether error 3253 has been resolved.<\/p><h3 class=\"wp-block-heading\" id=\"h-create-a-new-email-account\">Fix 5: Create a New Outlook Profile on Mac<\/h3><p>Set up a new email account manually in Mac Outlook by using a new profile.<\/p><ol style=\"list-style-type:1\" class=\"wp-block-list\">\n<li>Using the Finder option, locate the Outlook application.<\/li>\n\n\n\n<li>Right-click on the Outlook application and select Show Package Contents from the menu.<\/li>\n\n\n\n<li>Go to Content &gt;&gt; Share Support &gt;&gt; Outlook File Manager and double-click it.<\/li>\n\n\n\n<li>Click on create new profile options and provide the required information.\n<ol start=\"1\" style=\"list-style-type:lower-alpha\" class=\"wp-block-list\">\n<li>Click on Add Account &gt;&gt; select the account type from the various options available (Exchange\/Office 365 or POP\/IMAP).<\/li>\n\n\n\n<li>Fill in the required information and double-check it so that there will be no error. Then, click on Add Account button.<\/li>\n<\/ol>\n<\/li>\n<\/ol><p>If you want to add an Exchange or IMAP\/POP account, simply follow the steps below.<\/p><h3 class=\"wp-block-heading\" id=\"h-add-an-exchange-account\"><a><\/a>Add an Exchange account<\/h3><ol style=\"list-style-type:1\" class=\"wp-block-list\">\n<li>Select Exchange from the Add Button in the lower-left corner.<\/li>\n\n\n\n<li>Fill in all of the required details for the Exchange account to be created.<\/li>\n\n\n\n<li>To configure the Exchange account automatically, select &ldquo;Configure Automatically&rdquo; and click Add Account.<\/li>\n<\/ol><h3 class=\"wp-block-heading\" id=\"h-add-a-pop3-imap-account\"><a><\/a>Add a POP3\/IMAP account<\/h3><ol style=\"list-style-type:1\" class=\"wp-block-list\">\n<li>Select the Add Button option and then the Other Email option.<\/li>\n\n\n\n<li>Fill in the essential information required to create and set up the account.<\/li>\n\n\n\n<li>Choose the Add Account option that appears after clicking on the dropdown menu.<\/li>\n<\/ol><p>Check whether the error 3253 is fixed by sending a test email.<\/p><h2 class=\"wp-block-heading\" id=\"use-stellar-converter-for-olm-to-recover-mailbox-data\">Use Stellar Converter for OLM to Recover Mailbox Data<\/h2><p>The above-mentioned methods can help you resolve the Outlook error code 3253 on Mac. In case the error still persists or you&rsquo;re facing issues with your Outlook account, it is suggested you extract the mailbox data from the Outlook OLM file. For this, you can use a professional third-party tool, such as <a href=\"https:\/\/www.stellarinfo.com\/email-tools\/olm-to-pst-converter.php\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Stellar Converter for OLM<\/strong><\/a>. The software helps extract emails and other mailbox items from the OLM and save them in PST and various other formats.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Users of Mac Outlook have recently reported receiving an error code 3253.&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/fix-outlook-error-code-3253-macos\/\">Continue reading <span class=\"screen-reader-text\">Why are You Facing Outlook Error Code 3253 on Mac OS, and How to fix it?<\/span><\/a><\/p>\n","protected":false},"author":32,"featured_media":93523,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[837],"tags":[],"class_list":["post-93521","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-outlook-for-mac","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - 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Singh","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.stellarinfo.com\/blog\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/9e95cad83fe279b559794f62193f34300d01db8f9f2ec45ce529b7ecde3796ba?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9e95cad83fe279b559794f62193f34300d01db8f9f2ec45ce529b7ecde3796ba?s=96&d=mm&r=g","caption":"Ravi Singh"},"description":"Ravi Singh is a Senior Writer at Stellar\u00ae. He is an expert Tech Explainer, IoT enthusiast, and a passionate nerd with over 7 years of experience in technical writing. He writes about Microsoft Exchange, Microsoft 365, Email Migration, Linux, Windows, Mac, DIY Tech, and Smart Home. Ravi spends most of his weekends working with IoT (DIY Smart Home) devices and playing Overwatch. He is also a solo traveler who loves hiking and exploring new trails.","sameAs":["https:\/\/stellarinfo.com\/blog","https:\/\/facebook.com\/raavisingh","https:\/\/instagram.com\/ravi.s1ngh","https:\/\/linkedin.com\/in\/ravi-singh-5a65356a\/","https:\/\/x.com\/https:\/\/twitter.com\/ravi51ngh","https:\/\/youtube.com\/ravisingh9"],"url":"https:\/\/www.stellarinfo.com\/blog\/author\/ravi\/"}]}},"_links":{"self":[{"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/posts\/93521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/users\/32"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/comments?post=93521"}],"version-history":[{"count":6,"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/posts\/93521\/revisions"}],"predecessor-version":[{"id":185167,"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/posts\/93521\/revisions\/185167"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/media\/93523"}],"wp:attachment":[{"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/media?parent=93521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/categories?post=93521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stellarinfo.com\/blog\/wp-json\/wp\/v2\/tags?post=93521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}