{"id":9225,"date":"2026-06-01T09:35:20","date_gmt":"2026-06-01T07:35:20","guid":{"rendered":"https:\/\/mybox.com\/help\/?post_type=manual_kb&#038;p=9225"},"modified":"2026-06-01T09:35:22","modified_gmt":"2026-06-01T07:35:22","slug":"what-is-thunderbird","status":"publish","type":"manual_kb","link":"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/","title":{"rendered":"What is Thunderbird?"},"content":{"rendered":"\n<div class=\"translation-block translation-block-merged\">\n<p class=\"wp-block-paragraph\">Thunderbird is a free, open-source email application developed by the Mozilla community. It is designed to help users send, receive, and manage email accounts from a single program on their computer or mobile device.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike webmail services that run in a browser, Thunderbird is installed locally and works as an email client connected to external mail servers.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#What_Thunderbird_is_used_for\" >What Thunderbird is used for<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Key_features\" >Key features<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Multi-account_support\" >Multi-account support<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Unified_inbox\" >Unified inbox<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Customization\" >Customization<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Privacy_and_security\" >Privacy and security<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Supported_systems\" >Supported systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Advantages_of_Thunderbird\" >Advantages of Thunderbird<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mybox.com\/help\/en\/knowledgebase\/what-is-thunderbird\/#Summary\" >Summary<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Thunderbird_is_used_for\"><\/span>What Thunderbird is used for<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<\/div>\n\n<div id=\"mybox-2673423008\" class=\"mybox-content mybox-entity-placement\"><div class=\"early-access-banner-inpost\">\r\n  <div class=\"banner-left-inpost\">\r\n    <div class=\"icon-box-inpost\">\r\n      <img decoding=\"async\" src=\"https:\/\/mybox.com\/help\/wp-content\/uploads\/2026\/02\/square-info-icon.svg\" alt=\"Info\">\r\n    <\/div>\r\n    <div class=\"text-box-inpost\">\r\n      <span class=\"label-inpost\"><span class=\"translation-block translation-block-banner-text\">Early access<\/span><\/span>\r\n      <h4><span class=\"translation-block translation-block-banner-text\">Still need help?<\/span><\/h4>\r\n      <p><span class=\"translation-block translation-block-banner-text\">Contact our customer service team.<\/span><\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"banner-right-inpost\">\r\n    <a href=\"https:\/\/panel.mybox.com\/helpdesk2\/v\/list\/\" class=\"banner-button-inpost\"><span class=\"translation-block translation-block-banner-text\">Message us<\/span><\/a>\r\n  <\/div>\r\n<\/div><\/div>\n\n<div class=\"translation-block translation-block-merged\"><p class=\"wp-block-paragraph\">Thunderbird is mainly used for email management, but it also includes additional communication tools. Users can:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>manage multiple email accounts in one place<\/li>\n\n\n\n<li>send and receive emails using IMAP, POP3, and SMTP<\/li>\n\n\n\n<li>organize messages into folders and tags<\/li>\n\n\n\n<li>search through large mail archives<\/li>\n\n\n\n<li>manage contacts and calendars (via extensions or built-in features in newer versions)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_features\"><\/span>Key features<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Multi-account_support\"><\/span>Multi-account support<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Thunderbird allows users to connect several email accounts from different providers, such as Gmail, Outlook, or custom domain email servers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Unified_inbox\"><\/span>Unified inbox<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Users can view messages from multiple accounts in a single inbox for easier management.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Customization\"><\/span>Customization<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The application supports add-ons and extensions that can expand its functionality, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>calendar integration<\/li>\n\n\n\n<li>productivity tools<\/li>\n\n\n\n<li>interface themes<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Privacy_and_security\"><\/span>Privacy and security<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Thunderbird is known for its strong privacy focus. It includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>spam filtering<\/li>\n\n\n\n<li>phishing protection<\/li>\n\n\n\n<li>support for email encryption (OpenPGP and S\/MIME)<\/li>\n\n\n\n<li>no advertising or data tracking<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Supported_systems\"><\/span>Supported systems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thunderbird is available on multiple platforms, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Windows<\/li>\n\n\n\n<li>macOS<\/li>\n\n\n\n<li>Linux<\/li>\n\n\n\n<li>Android (Thunderbird Mobile)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Advantages_of_Thunderbird\"><\/span>Advantages of Thunderbird<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>free and open-source<\/li>\n\n\n\n<li>highly customizable<\/li>\n\n\n\n<li>works with many email providers<\/li>\n\n\n\n<li>strong privacy and security focus<\/li>\n\n\n\n<li>suitable for both personal and business use<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary\"><\/span>Summary<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thunderbird is a powerful email client that lets users manage multiple email accounts in one application. It is widely used as an alternative to web-based email services because of its flexibility, privacy features, and cross-platform support.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"template":"","format":"standard","manualknowledgebasecat":[41],"manual_kb_tag":[824,967,1784,4045,5512,5758,5759,5760,5761,5762],"class_list":["post-9225","manual_kb","type-manual_kb","status-publish","format-standard","hentry","manualknowledgebasecat-email","manual_kb_tag-open-source","manual_kb_tag-email-management","manual_kb_tag-email-client","manual_kb_tag-free-software","manual_kb_tag-customization","manual_kb_tag-thunderbird","manual_kb_tag-desktop-email-client","manual_kb_tag-multi-account-support","manual_kb_tag-unified-inbox","manual_kb_tag-addons"],"_links":{"self":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/9225","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb"}],"about":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/types\/manual_kb"}],"author":[{"embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/users\/1"}],"version-history":[{"count":1,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/9225\/revisions"}],"predecessor-version":[{"id":9226,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb\/9225\/revisions\/9226"}],"wp:attachment":[{"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/media?parent=9225"}],"wp:term":[{"taxonomy":"manualknowledgebasecat","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manualknowledgebasecat?post=9225"},{"taxonomy":"manual_kb_tag","embeddable":true,"href":"https:\/\/mybox.com\/help\/en\/wp-json\/wp\/v2\/manual_kb_tag?post=9225"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}