{"id":45587,"date":"2026-03-16T13:34:31","date_gmt":"2026-03-16T13:34:31","guid":{"rendered":"https:\/\/www.adviksoft.com\/blog\/?p=45587"},"modified":"2026-05-04T08:58:39","modified_gmt":"2026-05-04T08:58:39","slug":"thunderbird-smtp-error","status":"publish","type":"post","link":"https:\/\/www.adviksoft.com\/blog\/thunderbird-smtp-error\/","title":{"rendered":"How to Fix Thunderbird SMTP Error?"},"content":{"rendered":"<p>Are you facing the Thunderbird SMTP error while sending messages? You&#8217;re not alone. Many users face the same error when Thunderbird cannot connect to the outgoing mail server. In this article, we will explain the common cause of Thunderbird SMTP error &#8211; cannot send messages, and provide several troubleshooting steps to fix it.<\/p>\n<p>Mozilla Thunderbird is a free and open-source email platform. It offers several advanced features to manage emails, contacts, calendars, etc. As with other email platform it is not far away from issues. One common error is the SMTP error in Thunderbird. This error is usually occurs when Thunderbird fails to connect with the outgoing mail server.<\/p>\n<div class=\"red-border\">\n<h2>Common Reasons for Thunderbird SMTP Error<\/h2>\n<p>Here are some reasons behind SMTP error, cannot send messages:<\/p>\n<ul>\n<li><strong>Incorrect SMTP Server Settings:<\/strong> Wrong outgoing server name, port, or encryption can prevent Thunderbird from sending emails.<\/li>\n<li><strong>Wrong Username &amp; Password:<\/strong> Incorrect login credentials may cause authentication failure with the SMTP server.<\/li>\n<li><strong>Poor Internet Connection:<\/strong> An unstable internet connection can interrupt communication with the SMTP server.<\/li>\n<li><strong>Firewall or Antivirus Blocking:<\/strong> Security software may block Thunderbird from connecting to the mail server.<\/li>\n<\/ul>\n<\/div>\n<h2>Methods to Fix Thunderbird SMTP Error<\/h2>\n<p>In this section, we&#8217;ll discuss multiple techniques to solve SMTP error in Thunderbird. Try them one by one and check which one works for you.<\/p>\n<h3>1. Check SMTP Settings<\/h3>\n<p>1. Open Thunderbird on your system.<\/p>\n<p>2. Click on Menu icon and select Account Settings.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-45589\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/111-1.jpg\" alt=\"\" width=\"696\" height=\"496\" \/><\/p>\n<p>3. Choose Outgoing Server (SMTP) from the Account Settings.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45588\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/211-2.jpg\" alt=\"Choose Outgoing Server\" width=\"699\" height=\"555\" srcset=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/211-2.jpg 915w, https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/211-2-768x609.jpg 768w\" sizes=\"auto, (max-width: 699px) 100vw, 699px\" \/><\/p>\n<p>4. Check SMTP server details are correct for the configured email account.<\/p>\n<h3>2. Check Outgoing Email is Not Blocked<\/h3>\n<p>Sometimes, antivirus and firewall applications may block the emails of Thunderbird, which leads to the Thunderbird SMTP error. Go to Settings and turn them off to check if the firewall or antivirus software is causing the issue.<\/p>\n<p>Some ISPs block outgoing mail from port 25. So try to change the port number 465 or 587 to check error is solved or not.<\/p>\n<h3>3. Check Internet Connection<\/h3>\n<p>Sometimes SMTP error appears due to an unstable internet connection. Restart your internet router and try to open websites to verify connectivity. After that, restart Thunderbird and send emails again.<\/p>\n<h3>4. Reset SMTP Password<\/h3>\n<p>If the SMTP password is wrong cause of this error. Delete and reset the password to solve it.<\/p>\n<p>1. Open Thunderbird and go to Settings.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45593\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/321.jpg\" alt=\"go to Settings\" width=\"702\" height=\"494\" \/><\/p>\n<p>2. Click on password and select Saved Passwords.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45592\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/412.jpg\" alt=\"Thunderbird SMTP Error\" width=\"700\" height=\"491\" \/><\/p>\n<p>3. Choose the SMTP password and click on Remove.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45591\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/511-2.jpg\" alt=\"click on Remove\" width=\"701\" height=\"489\" \/><\/p>\n<p>4. Once the password is removed, configure the email account and try to send an email.<\/p>\n<h3>5. Migrate Thunderbird to Another Email Client<\/h3>\n<p>If you are still facing Thunderbird SMTP error after applying the above manual tricks. We suggest that you migrate your data to another email client like Outlook. Tey the <strong>Advik <a href=\"https:\/\/www.adviksoft.com\/thunderbird\/converter.html\">Thunderbird Converter<\/a><\/strong> that will help you to migrate Thunderbird mailbox data. With this utility, you can <a href=\"https:\/\/www.adviksoft.com\/blog\/export-thunderbird-to-pst-without-outlook\/\">export Thunderbird to PST<\/a>, which can later be imported into Outlook. This is a secure and authentic program that preserves the mailbox folder hierarchy as well during the process. It offers various saving options to export Thunderbird emails into multiple formats.<\/p>\n<p><a href=\"https:\/\/www.adviksoft.com\/dl\/advik-thunderbird-converter.exe\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-45405\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Download-Button-e1525685682329-1.png\" alt=\"\" width=\"213\" height=\"55\" \/><\/a>\u00a0 \u00a0 <a href=\"https:\/\/www.adviksoft.com\/buy\/thunderbird\/converter.html\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-45404\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/buy-now-button-8.png\" alt=\"\" width=\"190\" height=\"75\" \/><\/a><\/p>\n<p>1. Run the tool and choose your Thunderbird profile.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45585\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/thunderbird2-2-1-2.png\" alt=\"choose your Thunderbird profile\" width=\"702\" height=\"591\" srcset=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/thunderbird2-2-1-2.png 872w, https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/thunderbird2-2-1-2-768x646.png 768w\" sizes=\"auto, (max-width: 702px) 100vw, 702px\" \/><\/p>\n<p>2. Choose the mailbox folders &amp; subfolders.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45584\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/thunderbird3-3-1.png\" alt=\"Choose the mailbox folders\" width=\"701\" height=\"590\" srcset=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/thunderbird3-3-1.png 872w, https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/thunderbird3-3-1-768x646.png 768w\" sizes=\"auto, (max-width: 701px) 100vw, 701px\" \/><\/p>\n<p>3. Select a saving option from given list.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45595\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Screenshot-94-1-3.png\" alt=\"Thunderbird SMTP Error\" width=\"697\" height=\"584\" srcset=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Screenshot-94-1-3.png 868w, https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Screenshot-94-1-3-768x644.png 768w\" sizes=\"auto, (max-width: 697px) 100vw, 697px\" \/><\/p>\n<p>4. Browse target location and click Convert.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-45594\" src=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Screenshot-95-1.png\" alt=\"Thunderbird SMTP Error cannot send messages\" width=\"699\" height=\"587\" srcset=\"https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Screenshot-95-1.png 867w, https:\/\/www.adviksoft.com\/blog\/wp-content\/uploads\/2026\/03\/Screenshot-95-1-768x645.png 768w\" sizes=\"auto, (max-width: 699px) 100vw, 699px\" \/><\/p>\n<h3>Conclusion<\/h3>\n<p>SMTP error in Thunderbird can prevent users from sending emails. It&#8217;s a frustrating issue, but it can be solved with the right steps. In this post, we have explained several methods to fix Thunderbird SMTP Error &#8211; cannot send messages. By applying these solutions you can resolve the problem and send Thunderbird emails again.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Are you facing the Thunderbird SMTP error while sending messages? You&#8217;re not alone. Many users face the same error when Thunderbird cannot connect to the outgoing mail server. In this article, we will explain the common cause of Thunderbird SMTP error &#8211; cannot send messages, and provide several troubleshooting steps to fix it. Mozilla Thunderbird [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":45622,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[],"class_list":["post-45587","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mozilla-thunderbird"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix Thunderbird SMTP Error?<\/title>\n<meta name=\"description\" content=\"Want to fix Thunderbird SMTP Error - cannot send messages? 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With a strong understanding of tools like Microsoft Outlook and cloud platforms such as Microsoft 365, she creates clear, user-focused content that simplifies complex technical concepts for everyday users and IT professionals alike. She has extensive experience writing about email backup, file conversion, and data recovery technologies, helping businesses and individuals make informed decisions. Her content blends in-depth research with practical insights, making it both informative and easy to follow.\",\"url\":\"https:\\\/\\\/www.adviksoft.com\\\/blog\\\/author\\\/aloraeve\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How to Fix Thunderbird SMTP Error?","description":"Want to fix Thunderbird SMTP Error - cannot send messages? 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