{"id":119279,"date":"2023-01-04T10:34:01","date_gmt":"2023-01-04T10:34:01","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=119279"},"modified":"2026-03-30T06:03:53","modified_gmt":"2026-03-30T06:03:53","slug":"how-to-fix-invalid-base64-string-for-mime-content-error-in-apple-mail","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/how-to-fix-invalid-base64-string-for-mime-content-error-in-apple-mail\/","title":{"rendered":"How to Fix \u2018Invalid Base64 string for MIME content\u2019 Error in Apple Mail?"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><p>Several Apple Mail (Mac Mail) users have reported encountering the error <strong>&lsquo;<em>Invalid Base64 string for MIME Content<\/em>&rdquo;<\/strong>, after upgrading their Mac OS. Some users have also encountered this error after activating or creating the Rules. Due to this error, they&rsquo;re facing issues while moving messages and downloading emails. If you&rsquo;re one such user and facing this error, you can follow the solutions mentioned below to resolve the error.<\/p><h2 class=\"wp-block-heading\" id=\"methods-to-fix-&lsquo;invalid-base64-string-for-mime-content&rsquo;-error-in-apple-mail\"><strong>Methods to Fix &lsquo;Invalid Base64 string for MIME Content&rsquo; Error in Apple Mail<\/strong><\/h2><p>Sometimes, a simple restart of the application and system can resolve the issue. You can restart the Apple Mail application and the system, and see if it resolves the error. If not, then follow the below solutions to resolve the error.<\/p><h3 class=\"wp-block-heading\"><strong>Method 1: Disable and Re-enable Mail Services<\/strong><\/h3><p>You may encounter the <strong>&lsquo;Invalid Base64 string for MIME Content&rdquo;<\/strong> error if there is a problem with your email account. If this is the case, you can temporarily disable the email account and then enable it. Here are the steps to do so:<\/p><ol style=\"list-style-type:lower-alpha\" class=\"wp-block-list\">\n<li>Open the <strong>Mail app<\/strong> on your Mac Machine and select <strong>Mail &gt; Accounts<\/strong>.<\/li>\n\n\n\n<li>After selecting the mail account, <strong>deselect <\/strong>the <strong>Mail tick box<\/strong>.<\/li>\n\n\n\n<li>Close your <strong>application<\/strong>.<\/li>\n\n\n\n<li>Now <strong>start your Mail app<\/strong> and select the <strong>Mail tick box<\/strong> again.<\/li>\n\n\n\n<li>Check if the <strong>error <\/strong>is resolved.<\/li>\n<\/ol><h3 class=\"wp-block-heading\"><strong>Method 2: Delete Rules in Mac Mail<\/strong><\/h3><p>Several users were able to resolve the error after deleting the Rules in Mac Mail. You can delete the rules in Mac Mail and then see if the error persists. Here are the steps you can follow to delete the Rules:<\/p><ul class=\"wp-block-list\">\n<li>Start the <strong>Mac Mail<\/strong> application.<\/li>\n\n\n\n<li>Then select Mail and go to <strong>Preferences<\/strong>.<\/li>\n\n\n\n<li>Open the <strong>Rules <\/strong>tab and delete the <strong>required <\/strong>Rules.<\/li>\n\n\n\n<li>Then click on <strong>Remove <\/strong>and confirm.<\/li>\n\n\n\n<li>Close the <strong>Mail app<\/strong> and open it again. &nbsp;<\/li>\n<\/ul><h3 class=\"wp-block-heading\"><strong>Method 3: Start Your Mac in Safe Mode<\/strong><\/h3><p>You can start your Mac in&nbsp;Safe Mode. It helps&nbsp;to find out if the issue you&rsquo;re encountering is caused by a software that loads when the Mac starts up. To start Mac (with Apple silicon) in safe mode, follow these steps:<\/p><ul class=\"wp-block-list\">\n<li>On Mac, go to <strong>Apple menu<\/strong>&nbsp;and click<strong> Shut Down<\/strong>. Wait for system to shut down completely.<\/li>\n\n\n\n<li>Now press and hold the Power button until the <strong>&ldquo;Loading startup options&rdquo;<\/strong> appears.<\/li>\n\n\n\n<li>Choose a volume.<\/li>\n\n\n\n<li>Press and hold the <strong>Shift <\/strong>key.<\/li>\n\n\n\n<li>Then, click <strong>Continue <\/strong>in <strong>Safe Mode<\/strong>.<\/li>\n\n\n\n<li>The system will restart automatically and<strong> &ldquo;Safe Boot&rdquo;<\/strong> appears in the menu bar.<\/li>\n<\/ul><h3 class=\"wp-block-heading\"><strong>Method 4:Update Your macOS to the Latest Version<\/strong><\/h3><p>If the error has occurred due to any bug or issue in your macOS, then you can install the latest updates for your macOS. It may help fix the issue. Here are the steps to check and install updates:<\/p><ul class=\"wp-block-list\">\n<li>On the <strong>Apple menu<\/strong>, click on System Settings.<\/li>\n\n\n\n<li>Click on General and then <strong>Software Update<\/strong> (You may also choose System Preferences and then click on Software Update).<\/li>\n\n\n\n<li>If any update is available, click on <strong>Update Now or Upgrade Now <\/strong>button to install it.<\/li>\n\n\n\n<li>When prompted, enter your administrator credentials.<\/li>\n<\/ul><p><em><strong>Note:<\/strong> During the installation process, your Mac might restart and display blank screen several times.<\/em><\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/cloud.stellarinfo.com\/StellarConverterforMBOX-Corporate-B.exe\"><img loading=\"lazy\" decoding=\"async\" width=\"226\" height=\"62\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2023\/01\/Free-download-for-windows.png\" alt=\"Free Download for windows\" class=\"wp-image-122380 apply-gradient-on-post-images\"><\/a><\/figure>\n<\/div><h2 class=\"wp-block-heading\" id=\"still-facing-issues?-migrate-apple-mail-to-outlook\">Still Facing Issues? Migrate Apple Mail to Outlook<\/h2><p>The above given methods will help you fix the <strong>&lsquo;Invalid Base64 string for MME Content&rsquo;<\/strong> error. &nbsp;In case the error occurs again or you&rsquo;re facing trouble in accessing your emails on Mac Mail, then it is advisable to <strong><a href=\"https:\/\/www.stellarinfo.com\/blog\/transfer-mac-mail-emails-to-outlook\/\" target=\"_blank\" rel=\"noreferrer noopener\">migrate your Mac Mail emails to Microsoft Outlook<\/a><\/strong>. However, both email clients use different data file formats. Mac Mail uses MBOX files and Outlook uses PST. Hence, migrating or importing emails and other data from Mac Mail into Outlook requires conversion of MBOX files into Outlook compatible PST files.<\/p><p>However, the process of manually transferring mail from Apple Mail to Outlook will take a lot of time as it involves a lot of steps. A seamless way to perform the migration process from Apple Mail to Outlook is by using a reliable MBOX to PST converter tool, such as <strong><a href=\"https:\/\/www.stellarinfo.com\/email-tools\/mbox-to-pst-converter.php\" target=\"_blank\" rel=\"noreferrer noopener\">Stellar Converter for MBOX<\/a><\/strong>. The software can easily convert Mac Mail MBOX files into Outlook importable PST format. The software helps you to migrate all your emails, contacts, attachments, and other mailbox contents easily and quickly from Apple Mail to Microsoft Outlook.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Several Apple Mail (Mac Mail) users have reported encountering the error &lsquo;Invalid&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/how-to-fix-invalid-base64-string-for-mime-content-error-in-apple-mail\/\">Continue reading <span class=\"screen-reader-text\">How to Fix \u2018Invalid Base64 string for MIME content\u2019 Error in Apple Mail?<\/span><\/a><\/p>\n","protected":false},"author":32,"featured_media":119311,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[838],"tags":[4243,4244],"class_list":["post-119279","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mbox-file","tag-invalid-base64-string-for-mime-content","tag-invalid-base64-string-for-mime-content-error-in-apple-mail","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fix \u2018Invalid Base64 string for MIME content\u2019 Error in Apple Mail<\/title>\n<meta name=\"description\" content=\"Getting the &quot;Invalid Base64 string for MIME content&quot; error in Apple Mail? 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