{"id":4668,"date":"2016-12-18T03:15:25","date_gmt":"2016-12-18T03:15:25","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=4668"},"modified":"2026-01-02T09:33:05","modified_gmt":"2026-01-02T09:33:05","slug":"fix-common-problems-errors-mozilla-thunderbird","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/fix-common-problems-errors-mozilla-thunderbird\/","title":{"rendered":"How to Fix Common Problems and Errors in Mozilla Thunderbird"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"has-background\" style=\"background-color:#d9dfe4\"><em><strong>TIP:<\/strong>&nbsp;<em>Want to try an alternate email client such as Microsoft Outlook to overcome performance or other issues in Mozilla Thunderbird? Need a quick solution to convert Thunderbird MBOX file to Outlook PST format, try using <strong>Stellar Converter for MBOX<\/strong> software. It helps convert MBOX email clients such as Thunderbird, Apple Mail, Entourage, etc. to PST format in few simple steps.<\/em><\/em><\/p>\n\n\n\n<p><strong>Thunderbird<\/strong>, developed by<strong>&nbsp;Mozilla Corporation,<\/strong>&nbsp;is a&nbsp;<strong><em>free<\/em><\/strong>, open-source app that allows managing emails, chats, news feeds, and newsgroups quite efficiently. It is a&nbsp;<strong>desktop<\/strong>-based application that gives complete control and extensive ownership over the email messages. If you use Thunderbird, there are a number of add-ons available that you can install and utilize to customize and enhance the emailing experience.<\/p>\n\n\n\n<p>The best thing is that you can&nbsp;download, install, and use Mozilla Thunderbird for&nbsp;free&nbsp;under defined terms and conditions. Different versions of the application are available that supports Windows, Mac, and Linux platforms. In addition, the application is available in various languages and you can pick your own localized version for better understanding.<\/p>\n\n\n\n<p><img decoding=\"async\" class=\"apply-gradient-on-post-images\" style=\"width: 2px;\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-7.png\" alt=\"This image has an empty alt attribute; its file name is image-7.png\">Despite having&nbsp;numerous benefits, you may encounter issues or errors in Mozilla Thunderbird application that require timely troubleshooting.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why-thunderbird-issues-happen\">Why Thunderbird Issues Happen<\/h2>\n\n\n\n<p>Following are some common errors you may encounter when using the Thunderbird application, along with the solutions:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-problem-1-cannot-delete-messages\">Problem 1: Cannot Delete Messages<\/h3>\n\n\n\n<p>Users often find it difficult to delete messages in Thunderbird. This may happen due to a corrupt trash folder.<\/p>\n\n\n\n<p><strong>Solution <\/strong>&ndash; To overcome the inability to delete messages from Thunderbird, follow the steps below:<\/p>\n\n\n\n<p><strong>Step 1:<\/strong> Open the Profile folder by clicking on the&nbsp;Menu&nbsp;button from the top right of the Thunderbird window, and do the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Select&nbsp;<strong>Help<\/strong>,&nbsp;and then click <strong>Troubleshooting Information<\/strong>.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"429\" height=\"390\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-11.png\" alt=\"Troubleshooting Information in Help menu selected.\" class=\"wp-image-60102 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-11.png 429w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-11-300x273.png 300w\" sizes=\"auto, (max-width: 429px) 100vw, 429px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>From the <strong>Troubleshooting Information<\/strong>&nbsp;tab, click the <strong>Open Folder<\/strong>&nbsp;button under&nbsp;<strong>Application Basics <\/strong>section.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"490\" height=\"364\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-12.png\" alt=\"Open Folder: Troubleshooting Information in Application Basics.\" class=\"wp-image-60103 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-12.png 490w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-12-300x223.png 300w\" sizes=\"auto, (max-width: 490px) 100vw, 490px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A window will appear displaying a list of profile files.<\/li>\n<\/ul>\n<\/div><\/div><p><strong>Step 2: <\/strong>Close your Thunderbird application.<\/p><p><strong>Step 3: <\/strong>In the&nbsp;<strong>File Manager<\/strong>, open the&nbsp;<strong>Mail<\/strong>&nbsp;folder or&nbsp;<strong>ImapMail<\/strong>&nbsp;folder (as per POP or IMAP account you are using).<\/p><p><strong>Step 4: <\/strong>Open the folder by using incoming mail server name (such as imap.googlemail.com or pop.googlemail.com).<\/p><p><strong>Step 5: <\/strong>Choose&nbsp;<strong>Trash<\/strong>&nbsp;and&nbsp;<strong>Trash.<\/strong><strong>msf<\/strong>&nbsp;files and erase them.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"625\" height=\"298\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-13.png\" alt=\"Close Thunderbird, open Mail folder, erase Trash files.\" class=\"wp-image-60104 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-13.png 625w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-13-300x143.png 300w\" sizes=\"auto, (max-width: 625px) 100vw, 625px\" \/><\/figure><p class=\"has-very-light-gray-background-color has-background\"><em><strong>Note:<\/strong> In several accounts, these files may be named as&nbsp;Deleted&nbsp;or&nbsp;Bin.<\/em><\/p><p><strong>Step 6: <\/strong>Restart&nbsp;Thunderbird.<\/p><p>In the case of&nbsp;<strong>IMAP<\/strong>, a new Trash folder will get automatically generated by Thunderbird.<\/p><p>However, in case of&nbsp;<strong>POP<\/strong>, you need to create the Trash folder. For this, go to the&nbsp;<strong>Folder List<\/strong>&nbsp;and then right-click the account name and select&nbsp;<strong>New Folder<\/strong>. Next, provide the folder name as <strong>Trash<\/strong> and click on&nbsp;<strong>Create Folder<\/strong>&nbsp;to confirm.<\/p><p>Once the trash folder reappears, check if you can delete your messages or not. If not, you can<strong>&nbsp;switch<\/strong>&nbsp;the emailing app to MS Outlook which is comparatively proficient and organized. To utilize MS Outlook, you will need to move all the data from&nbsp;<a href=\"https:\/\/www.stellarinfo.com\/email-tools\/mbox-to-pst-converter.php\" target=\"_blank\" rel=\"noreferrer noopener\">MBOX to PST<\/a>&nbsp;files.<\/p><p><strong>Read this: <\/strong><a href=\"https:\/\/www.stellarinfo.com\/blog\/convert-thunderbird-mbox-to-outlook-pst-or-office-365\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Convert Thunderbird MBOX file into MS Outlook PST or Office 365<\/strong><\/a><\/p><h3 class=\"wp-block-heading\" id=\"h-problem-2-unable-to-send-email-messages\">Problem 2: Unable to Send Email Messages<\/h3><p>If you are unable to send email messages from your Thunderbird account, there can be two reasons behind this:<\/p><ul class=\"wp-block-list\">\n<li>Inappropriate Thunderbird Settings<\/li>\n\n\n\n<li>Blocked <strong>Port 25<\/strong> by ISP (Internet Service Provider)<\/li>\n<\/ul><p><strong>Solution &ndash;<\/strong> To resolve this error in Mozilla Thunderbird, perform the following:<\/p><p><strong>Step 1: <\/strong>Ensure that Thunderbird settings are appropriately configured:<\/p><ul class=\"wp-block-list\">\n<li>Incoming mail server (POP3\/IMAP server): mail.yourdomain.com<\/li>\n\n\n\n<li>Outgoing mail server (<strong>SMTP server<\/strong>): mail.yourdomain.com<\/li>\n\n\n\n<li>Username: the full e-mail address like <strong>email@yourdomain.com<\/strong><\/li>\n\n\n\n<li>SMTP authentication must be enabled for the login to be successful.<\/li>\n<\/ul><p><strong>Step 2: <\/strong>Try using alternative TCP&nbsp;port 2525&nbsp;for SMTP Server.<\/p><p class=\"has-very-light-gray-background-color has-background\"><strong><em>Note:<\/em><\/strong><em>&nbsp;If you fail to&nbsp;rectify&nbsp;this issue, you can convert emails and other components from&nbsp;MBOX to PST&nbsp;file format for utilizing the smooth functionality of MS Outlook.<\/em><\/p><h3 class=\"wp-block-heading\" id=\"h-problem-3-cannot-receive-messages\">Problem 3: Cannot Receive Messages<\/h3><p>If the Thunderbird account fails to receive messages, check whether the account is configured correctly. <\/p><p><strong><strong>Solution <\/strong>&ndash; <\/strong>To check settings for Thunderbird account, follow these steps:<\/p><p><strong>Step 1: <\/strong>Select&nbsp;<strong>Tools<\/strong>,&nbsp;and then click <strong>Account Settings<\/strong>.<\/p><p><strong><em>Note: <\/em><\/strong><em>If you cannot find Account Settings option under Tools after clicking on the menu on the right, press the &lsquo;Alt&rsquo; key. This will open the hidden menu bar in Thunderbird. From this menu bar, click Tools &gt; Account Settings. <\/em><em><\/em><\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"624\" height=\"330\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-14.png\" alt=\"Click 'Account Settings' under 'Tools'.\" class=\"wp-image-60105 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-14.png 624w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-14-300x159.png 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><\/figure><p><strong>Step 2: <\/strong>From the list that appears on the left pane, select&nbsp;<strong>Server Settings<\/strong>.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"545\" height=\"507\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-15.png\" alt=\"Select Server Settings from left pane list.\" class=\"wp-image-60106 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-15.png 545w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-15-300x279.png 300w\" sizes=\"auto, (max-width: 545px) 100vw, 545px\" \/><\/figure><p><strong>Step 3: <\/strong>You can see the configuration settings at the top of the page to verify the connection to the incoming mail server.<\/p><p><strong>Step 4: <\/strong>The email account provider gives you connection information about the servers. Ensure that the account settings match these settings<\/p><h3 class=\"wp-block-heading\" id=\"h-problem-4-thunderbird-closes-unexpectedly\">Problem 4: Thunderbird Closes Unexpectedly<\/h3><p>When Thunderbird exits unexpectedly, the situation is referred to as application crash. When that happens, Mozilla Crash Reporter appears.  asking you if you would like to &ldquo;<em>send your crash information to <strong>Mozilla<\/strong> for processing<\/em>&rdquo;. Numerous reasons are responsible for the crash..<\/p><p><strong>Solution<\/strong> &ndash; The best way to resolve the issue is to post crash report ID or attach a stack-trace in the bug report or on a forum.<\/p><p>Refer to this <a href=\"https:\/\/support.mozilla.org\/en-US\/kb\/mozilla-crash-reporter-tb#w_viewing-crash-r\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">link<\/a> to get information about getting your crash report ID. In case, the Mozilla Crash Reporter doesn&rsquo;t open or fails to submit the crash report, try <a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Mozilla\/How_to_get_a_stacktrace_for_a_bug_report\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">getting a stack-trace for a bug report<\/a>. This will help rectify the actual reason<\/p><p>You can also <strong>run Thunderbird in safe mode<\/strong> and check if the application crashes due to add-ons.<\/p><p class=\"has-very-light-gray-background-color has-background\"><em><strong>TIP:<\/strong> Need to access emails but still experiencing issue in opening Thunderbird? Export data from&nbsp;<strong>Thunderbird to PST<\/strong>&nbsp;format by using Stellar Converter for MBOX software. It is a specialized MBOX to PST converter tool that helps convert MBOX email clients to Outlook PST format.<\/em><\/p><p class=\"has-small-font-size\"><strong>Read this: <\/strong><a href=\"https:\/\/www.stellaroutlooktools.com\/blog\/export-thunderbird-emails-to-outlook\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Most Common Ways to Export Thunderbird Emails to Outlook<\/strong><\/a><\/p><h3 class=\"wp-block-heading\" id=\"h-problem-5-thunderbird-warns-that-the-server-doesn-t-use-encryption\">Problem 5: Thunderbird Warns that the Server doesn&rsquo;t Use Encryption<\/h3><p>When configuring an email account in Thunderbird, you may get a warning message (see the image below) if your server doesn&rsquo;t support encryption.<\/p><figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"624\" height=\"384\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-16.png\" alt=\"Thunderbird warning: Server lacks encryption support.\" class=\"wp-image-60107 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-16.png 624w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/07\/image-16-300x185.png 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><\/figure><p><strong>Solution<\/strong> &ndash; Perform the following steps to resolve this issue:<\/p><p><strong>Step 1: <\/strong>First of all, verify if the server supports encryption. If it does, change Thunderbird settings by clicking the <strong>Change Settings<\/strong> button and implement correct settings.<\/p><p><strong>Step 2: <\/strong>If the mail Server doesn&rsquo;t support encryption, then, you may use it at your own risk. For this, check the box associated to&nbsp;<strong>I understand the risk<\/strong>&nbsp;and click on&nbsp;<strong>Create Account<\/strong>&nbsp;button. Alternatively, switch to mail service provider that offers a secure connection such as Yahoo, Gmail, etc.<\/p><h3 class=\"wp-block-heading\" id=\"h-problem-6-mozilla-thunderbird-won-t-open-or-not-starting\">Problem 6: Mozilla Thunderbird Won&rsquo;t Open or Not Starting<\/h3><p>Users often report about Thunderbird application not opening or starting on their computer.<\/p><p><strong>Solution<\/strong> &ndash; To resolve this issue or to fix <strong>Thunderbird crashes <\/strong>issue, <strong>start Thunderbird in Safe Mode<\/strong> to troubleshoot persisting issues and error.<\/p><p>In the Safe Mode, you can reset Thunderbird settings or disable the add-ons that are creating issues. To verify, if the problem is being caused by a specific add-on, try comparing application behavior in normal mode to that of the behavior in safe mode.<\/p><p class=\"has-text-align-left\"><strong> Step 1: <\/strong>To start Thunderbird in safe mode, follow the steps below:<\/p><ul class=\"wp-block-list\">\n<li>When Thunderbird is not running: Press and hold down the&nbsp;<strong>Shift<\/strong>&nbsp;key while starting Thunderbird to open it in safe mode.<\/li>\n\n\n\n<li>When Thunderbird is running: Click on the&nbsp;<strong>Help<\/strong>&nbsp;menu from the top of Thunderbird window, and then select&nbsp;<strong>Restart with Add-ons Disabled&hellip;<\/strong>&nbsp;menu item.<\/li>\n\n\n\n<li>Next, click&nbsp;<strong>Restart<\/strong>&nbsp;button in the dialog box.<\/li>\n<\/ul><p><strong>Step 2<\/strong>: In the <strong>Thunderbird Safe Mode<\/strong>&nbsp;dialog box, click the&nbsp;<strong>Continue in Safe Mode<\/strong>&nbsp;button to start the application in safe mode.<\/p><h3 class=\"wp-block-heading\" id=\"h-problem-7-problem-configuring-email-alias\">Problem 7: Problem Configuring Email Alias<\/h3><p>An email address that forwards messages to another email account is referred to as the alias. Once you setup email alias, you can freely configure Thunderbird for downloading and sorting messages to the alias account. The messages are received in the same manner as they are received in the primary account.<\/p><p>Some users reported that they cannot find option to send messages to the email alias. Essentially, they have problem configuring email alias.<\/p><p><strong>Solution<\/strong> &ndash; The example specified herein will explain the procedure to configure Windows Live Mail or Hotmail account to send messages to the email alias in your Inbox.<\/p><p><strong>Step 1: <\/strong>Sign in with&nbsp;<strong>Hotmail<\/strong>&nbsp;account, click on&nbsp;<strong>Options<\/strong>,&nbsp;and then select&nbsp;<strong>More Options<\/strong>.<\/p><p><strong>Step 2: <\/strong>Under&nbsp;<strong>Customizing Hotmail<\/strong>, click on&nbsp;<strong>Rules<\/strong>&nbsp;for sorting new messages to configure the way in which messages are sorted.<\/p><p><strong>Step 3: <\/strong>Delete the rule that specifies to place the new email messages into its own folder.<\/p><h2 class=\"wp-block-heading\" id=\"what-next?\">What Next?<\/h2><p>The above-discussed issues and <strong>errors in Thunderbird <\/strong>can affect the performance as well as the functionality of the application. In order to avoid such errors, you can use any alternate emailing client such as MS Outlook. The desktop-based emailing program is efficient enough to offer responsive features and function.<\/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-1.png\" alt=\"Free Download for windows\" class=\"wp-image-122415 apply-gradient-on-post-images\"><\/a><\/figure>\n<\/div><p>However, Outlook does not support the Thunderbird MBOX file format. And so, to move data from Thunderbird to Outlook, you need to convert MBOX to PST file format. While there are manual workarounds available to perform the conversion, they can be time-consuming and might not deliver expected results. A better alternative is to use <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> software.<\/p><p><strong>Stellar Converter for MBOX<\/strong> helps convert Thunderbird MBOX file to PST file format in three simple steps: &lsquo;Select MBOX file&rsquo;, &lsquo;Convert&rsquo;, and &lsquo;Preview &amp; Save&rsquo;. It also helps convert MBOX file of various email clients such as Apple Mail, SeaMonkey, Entourage, Eudora, Mozilla Mail and many others to PST format.<\/p><h2 class=\"wp-block-heading\" id=\"the-bottom-line\">The Bottom Line<\/h2><p>Are you finding it difficult to fix the <strong>common problems or errors in Mozilla Thunderbird<\/strong>? Do you want to switch to MS Outlook? If yes, then you will require specialized MBOX to PST tool to export all the emails and other components from&nbsp;<strong><em>Thunderbird to PST<\/em><\/strong>&nbsp;supported by MS Outlook. For automatic<\/p>\n","protected":false},"excerpt":{"rendered":"<p>TIP:&nbsp;Want to try an alternate email client such as Microsoft Outlook to&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/fix-common-problems-errors-mozilla-thunderbird\/\">Continue reading <span class=\"screen-reader-text\">How to Fix Common Problems and Errors in Mozilla Thunderbird<\/span><\/a><\/p>\n","protected":false},"author":7,"featured_media":8095,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[838],"tags":[639,437,438,439],"class_list":["post-4668","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mbox-file","tag-mbox-to-pst-download","tag-mozilla-thunderbird-not-working","tag-thunderbird-does-not-work","tag-thunderbird-stopped-receiving-emails","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin 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