{"id":10414,"date":"2025-10-23T11:53:33","date_gmt":"2025-10-23T15:53:33","guid":{"rendered":"https:\/\/www.pair.com\/support\/kb\/?post_type=ht_kb&#038;p=10414"},"modified":"2026-04-14T12:48:28","modified_gmt":"2026-04-14T16:48:28","slug":"pair-email-thunderbird","status":"publish","type":"ht_kb","link":"https:\/\/www.pair.com\/support\/kb\/pair-email-thunderbird\/","title":{"rendered":"Setting Up Email: Thunderbird for Windows 11"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Prerequisites:&nbsp;<\/h2>\n\n\n\n<ul>\n<li>Your Pair custom email address and password. See <a href=\"https:\/\/www.pair.com\/support\/kb\/virtual-mailboxes\/\" target=\"_blank\" rel=\"noreferrer noopener\">A Guide to Mailboxes<\/a>.<\/li>\n\n\n\n<li>Your incoming and outgoing mail server information. See <a href=\"https:\/\/www.pair.com\/support\/kb\/how-to-find-your-custom-emails-incoming-and-outgoing-servers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Finding Your Incoming and Outgoing Servers<\/a>.&nbsp;<\/li>\n\n\n\n<li>Thunderbird on a Windows 11 device<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Finding Information About Your Account Settings<\/h2>\n\n\n\n<p>If you need help finding your username and other configuration settings, see our article, <a href=\"https:\/\/www.pair.com\/support\/kb\/setting-up-an-e-mail-reader\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Set Up an Email Reader<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Setting Up Your Email with Thunderbird on Windows 11&nbsp;&nbsp;<\/h2>\n\n\n\n<p>The process differs depending on whether you\u2019re an established Thunderbird user or you\u2019re setting up Thunderbird for the first time on this device. See instructions for each scenario below:&nbsp;<\/p>\n\n\n\n<ul>\n<li><a href=\"#First-Time-Thunderbird-Setup\">First Time Thunderbird Setup<\/a><\/li>\n\n\n\n<li><a href=\"http:\/\/Adding-an-Additional-Email-to-Thunderbird-via-Account-Hub\" target=\"_blank\" rel=\"noreferrer noopener\">Adding an Additional Email to Thunderbird<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">First Time Thunderbird Setup<\/h3>\n\n\n\n<p>Setting up Thunderbird for the first time? Follow these steps to get started.&nbsp;<\/p>\n\n\n\n<p>Note that these instructions are for Thunderbird version <strong>149.0<\/strong> and may not work for other versions. <\/p>\n\n\n\n<ol>\n<li>Open Thunderbird on Windows 11<\/li>\n\n\n\n<li>Fill in the fields: <\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Your full name<\/td><td>Enter the name you want to appear in the <em>From<\/em> field when you send messages.&nbsp;<br>Example: Jane Smith<\/td><\/tr><tr><td>Email Address<\/td><td>Enter your complete email address.&nbsp;<br>Example: jane@domain.com<\/td><\/tr><tr><td>Password<\/td><td>Enter the password for your email account.&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ol start=\"6\">\n<li>Click <strong>Configure manually<\/strong><img decoding=\"async\" loading=\"lazy\" width=\"800\" height=\"411\" class=\"wp-image-10420\" style=\"width: 700px;\" src=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first2.png\" alt=\"configure manually button image\" srcset=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first2.png 800w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first2-300x154.png 300w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first2-768x395.png 768w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first2-50x26.png 50w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first2-60x31.png 60w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first2-100x51.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><strong> <\/strong><\/li>\n\n\n\n<li>Fill in the Incoming and Outgoing Server settings: <\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td colspan=\"2\">Incoming Server<\/td><\/tr><tr><td>Protocol<\/td><td>Choose IMAP or POP.&nbsp;<br>See <a href=\"https:\/\/www.pair.com\/support\/kb\/imap-vs-pop-which-should-you-use\/\" target=\"_blank\" rel=\"noreferrer noopener\">IMAP vs POP: Which Should You Use?&nbsp;<\/a><\/td><\/tr><tr><td>Hostname<\/td><td>Enter your incoming mail server. This is usually one of the following formats:&nbsp;<br><br>  - username.mail.pairserver.com<br>  - mailX.pair.com<br><br>To find your exact server name, see <a href=\"https:\/\/www.pair.com\/support\/kb\/how-to-find-your-custom-emails-incoming-and-outgoing-servers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Finding Your Incoming and Outgoing Servers.&nbsp;<\/a><\/td><\/tr><tr><td>Port<\/td><td>Enter the port number for your account type. Common defaults are IMAP: 993 (SSL\/TLS) or POP: 995 (SSL\/TLS).<br>Example: 993, 995<\/td><\/tr><tr><td>Connection Security<\/td><td>Select the encryption type used to secure your connection. Common options include SSL\/TLS or STARTTLS.<\/td><\/tr><tr><td>Authentication Method<\/td><td>Select the method your mail client uses to authenticate.&nbsp;<\/td><\/tr><tr><td>Username<\/td><td>Enter your full email address.&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td colspan=\"2\">Outgoing Server<\/td><\/tr><tr><td>Hostname<\/td><td>Enter your outgoing mail server. This is usually one of the following formats:&nbsp;<br><br>  - username.mail.pairserver.com<br>  - mailX.pair.com<br><br>To find your exact server name, see <a href=\"https:\/\/www.pair.com\/support\/kb\/how-to-find-your-custom-emails-incoming-and-outgoing-servers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Finding Your Incoming and Outgoing Servers.&nbsp;<\/a><\/td><\/tr><tr><td>Port<\/td><td>Enter the port number for your account type. A common default is 587 (STARTTLS).&nbsp;<br><br>Example: 587<\/td><\/tr><tr><td>Connection Security<\/td><td>Select the encryption type used to secure your connection. Common options include SSL\/TLS or STARTTLS.<\/td><\/tr><tr><td>Authentication Method<\/td><td>Select the method your mail client uses to authenticate.&nbsp;<\/td><\/tr><tr><td>Username<\/td><td>Enter your full email address.&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3.png\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" src=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3.png\" alt=\"Pair email Thunderbird setup screenshot\" class=\"wp-image-10421\" width=\"700\" srcset=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3.png 800w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3-300x188.png 300w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3-768x482.png 768w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3-50x31.png 50w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3-60x38.png 60w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first3-100x63.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<ol start=\"8\">\n<li>Click <strong>Done.<\/strong><br><br>If the <strong>Done <\/strong>button is unavailable, click <strong>Re-test<\/strong> to verify your settings. Once the test completes successfully, <strong>Done<\/strong> becomes available.<\/li>\n\n\n\n<li>Click <strong>Finish<\/strong><\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Adding an Additional Email to Thunderbird (via Account Hub)<\/h4>\n\n\n\n<p>After you add your first account, Thunderbird may automatically enable its experimental Account Hub workflow for adding additional accounts.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-danger\">The Account Hub feature may cause errors with some custom email addresses. If you encounter this issue, see: <a href=\"#Turning-Off-the-Account-Hub-Feature\" target=\"_blank\" rel=\"noreferrer noopener\">Turning Off the Account Hub Feature<\/a>.<\/p>\n\n\n\n<ol>\n<li>Open Thunderbird on Windows 11<\/li>\n\n\n\n<li>Click the menu button (\u2630) in the upper right corner<\/li>\n\n\n\n<li>Click <strong>New Account<\/strong><\/li>\n\n\n\n<li>Click <strong>Email<\/strong><img decoding=\"async\" loading=\"lazy\" width=\"800\" height=\"373\" class=\"wp-image-10422\" style=\"width: 700px;\" src=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first1-1.png\" alt=\"Add Account -&gt; Email button image\" srcset=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first1-1.png 800w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first1-1-300x140.png 300w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first1-1-768x358.png 768w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first1-1-50x23.png 50w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first1-1-60x28.png 60w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/first1-1-100x47.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><strong> <\/strong><\/li>\n\n\n\n<li>Enter the following information:<br><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Full Name<\/td><td>Enter the name you want to appear in the <em>From<\/em> field when you send messages.&nbsp;<br>Example: Jane Smith<\/td><\/tr><tr><td>Email Address<\/td><td>Enter your complete email address.&nbsp;<br>Example: jane@domain.com<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1.png\" data-rel=\"lightbox-image-1\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" src=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1.png\" alt=\"Account Hub step one image\" class=\"wp-image-10423\" width=\"700\" srcset=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1.png 800w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1-300x225.png 300w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1-768x576.png 768w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1-50x38.png 50w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1-60x45.png 60w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional1-100x75.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<ol start=\"6\">\n<li>Click <strong>Continue<\/strong><\/li>\n\n\n\n<li>Click <strong>Edit Configuration<\/strong>.&nbsp;<\/li>\n\n\n\n<li>Fill in the Incoming Server Settings: <\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Protocol<\/td><td>Choose IMAP or POP.&nbsp;<br>See <a href=\"https:\/\/www.pair.com\/support\/kb\/imap-vs-pop-which-should-you-use\/\">IMAP vs POP: Which Should You Use?&nbsp;<\/a><\/td><\/tr><tr><td>Hostname<\/td><td>Enter your incoming mail server. This is usually one of the following formats:&nbsp;<br><br>  - username.mail.pairserver.com<br>  - mailX.pair.com<br><br>To find your exact server name, see <a href=\"https:\/\/www.pair.com\/support\/kb\/how-to-find-your-custom-emails-incoming-and-outgoing-servers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Finding Your Incoming and Outgoing Servers.&nbsp;<\/a><a href=\"https:\/\/www.pair.com\/support\/kb\/how-to-find-your-custom-emails-incoming-and-outgoing-servers\/\">&nbsp;<\/a><\/td><\/tr><tr><td>Port<\/td><td>Enter the port number for your account type. Common defaults are IMAP: 993 (SSL\/TLS) or POP: 995 (SSL\/TLS).<br>Example: 993, 995<\/td><\/tr><tr><td>Connection Security<\/td><td>Select the encryption type used to secure your connection. Common options include SSL\/TLS or STARTTLS.<\/td><\/tr><tr><td>Authentication Method<\/td><td>Select the method your mail client uses to authenticate.&nbsp;<\/td><\/tr><tr><td>Username<\/td><td>Enter your full email address.&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2.png\" data-rel=\"lightbox-image-2\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" loading=\"lazy\" width=\"800\" height=\"605\" src=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2.png\" alt=\"Incoming server settings for the account hub image\" class=\"wp-image-10424\" srcset=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2.png 800w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2-300x227.png 300w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2-768x581.png 768w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2-50x38.png 50w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2-60x45.png 60w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional2-100x76.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<ol start=\"8\">\n<li>Click <strong>Continue<\/strong><\/li>\n\n\n\n<li>Fill in the Outgoing Server Settings:<br><\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Protocol<\/td><td>The protocol used for sending mail. Thunderbird uses SMTP for all outgoing mail.&nbsp;<\/td><\/tr><tr><td>Hostname<\/td><td>Enter your outgoing mail server. This is usually one of the following formats:&nbsp;<br><br>  - username.mail.pairserver.com<br>  - mailX.pair.com<br><br>To find your exact server name, see <a href=\"https:\/\/www.pair.com\/support\/kb\/how-to-find-your-custom-emails-incoming-and-outgoing-servers\/\" target=\"_blank\" rel=\"noreferrer noopener\">Finding Your Incoming and Outgoing Servers.&nbsp;<\/a><a href=\"https:\/\/www.pair.com\/support\/kb\/how-to-find-your-custom-emails-incoming-and-outgoing-servers\/\">&nbsp;<\/a><\/td><\/tr><tr><td>Port<\/td><td>Enter the port number for your account type. A common default is 587 (STARTTLS).&nbsp;<br>Example: 587<\/td><\/tr><tr><td>Connection Security<\/td><td>Select the encryption type used to secure your connection. Common options include SSL\/TLS or STARTTLS.<\/td><\/tr><tr><td>Authentication<\/td><td>Select the method your mail client uses to authenticate.&nbsp;<\/td><\/tr><tr><td>Username<\/td><td>Enter your full email address.&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3.png\" data-rel=\"lightbox-image-3\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" src=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3.png\" alt=\"Pair email Thunderbird setup screenshot\" class=\"wp-image-10425\" width=\"700\" srcset=\"https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3.png 800w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3-300x227.png 300w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3-768x582.png 768w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3-50x38.png 50w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3-60x45.png 60w, https:\/\/www.pair.com\/support\/kb\/wp-content\/uploads\/2025\/10\/additional3-100x76.png 100w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure>\n\n\n\n<ol start=\"10\">\n<li>Click <strong>Test<\/strong><\/li>\n\n\n\n<li>Click <strong>Continue<\/strong><\/li>\n\n\n\n<li>Enter the password for your email account<\/li>\n\n\n\n<li>Click <strong>Continue<\/strong><\/li>\n\n\n\n<li>Choose any address books or calendars you would like to sync to your account<\/li>\n\n\n\n<li>Click <strong>Continue<\/strong><\/li>\n\n\n\n<li>Click <strong>Finish<\/strong><\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\">Turning Off the Account Hub Feature<\/h4>\n\n\n\n<p>If you run into errors or an infinite loading bug when adding additional accounts through the Account Hub feature, you can temporarily disable Account Hub by following these steps:<\/p>\n\n\n\n<ol>\n<li>Open Thunderbird on Windows 11<\/li>\n\n\n\n<li>Click the menu button (\u2630) in the upper right corner<\/li>\n\n\n\n<li>Click <strong>Settings<\/strong><\/li>\n\n\n\n<li>In the Account Hub section, uncheck <strong>Create accounts in the new Account Hub&nbsp;<\/strong><\/li>\n<\/ol>\n\n\n\n<p>After disabling this option, follow the steps in the First Time Thunderbird Setup tutorial above to add additional email addresses to Thunderbird.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\">The Account hub feature is experimental and may change in future Thunderbird versions. If Thunderbird removes this option or updates the Account Hub, this workaround may no longer be needed.<em>&nbsp;<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Using SSL to Secure Your Email<\/h2>\n\n\n\n<p>Pair Networks provides support for SSL\/TLS and STARTTLS encryption for all IMAP, POP, and authenticated SMTP connections. Using encryption is an important way to prevent your password from being stolen.<\/p>\n\n\n\n<p>POPS\/IMAPS only secures the connection between your email reader and the mail server. Once it reaches the mail server, it will be in plain text. For additional security, you would need to encrypt the email message itself. The port for POPS is 995, the port for the IMAPS is 993, and the ports for encrypted authenticated SMTPAUTH are 465 and 587. These are the standard ports for these services, and you should not need to manually set them.<\/p>\n\n\n\n<p>Please note that we replaced the secure certificate used to provide POPS, IMAPS, and SMTPS email services (sending and receiving email over SSL). Our SSL certificate vendor has changed to a new \"root\" certificate, which is recognized by most, but not all, email programs. If your email program begins returning errors and indicates that the server certificate is not recognized, please download the root certificate below and install it in your email program. The specifics of how to install a certificate will vary from program to program -- please consult the help files of your program for details.<\/p>\n\n\n\n<p><a href=\"http:\/\/crt.usertrust.com\/USERTrustRSAAddTrustCA.crt\">USERTrust RSA CA Root.crt<\/a><\/p>\n\n\n\n<p>Please also note that our mail servers use an SSL certificate. If you use this SSL option in conjunction with a domain name, your email reader may warn you that the domain names do not match. Some email readers will allow you to ignore this warning. In these cases, your incoming email will remain secure.<\/p>\n\n\n\n<p>However, some email readers will not let you proceed if the security certificates do not match. If this occurs, please verify your incoming server settings as follows:<br><br><strong>For accounts created prior to June 1, 2011, the email server will follow this formula:&nbsp;<\/strong><\/p>\n\n\n\n<p>mailX.pair.com<br>(where X is your server number)<\/p>\n\n\n\n<p><strong>For accounts created on or after June 1, 2011, the email server will follow this formula:&nbsp;<\/strong><\/p>\n\n\n\n<p>username.mail.pairserver.com<br>(where \"username\" is your main account username)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Prerequisites:&nbsp; Finding Information About Your Account Settings If you need help finding your username and other configuration settings, see our article, How to Set Up an Email Reader. Setting Up Your Email with Thunderbird on Windows 11&nbsp;&nbsp; The process differs depending on whether you\u2019re an established Thunderbird user or you\u2019re&#8230;<\/p>\n","protected":false},"author":11,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":[],"ht-kb-category":[12],"ht-kb-tag":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Set Up Pair Email in Thunderbird on Windows 11<\/title>\n<meta name=\"description\" content=\"Set up your Pair Networks email in Thunderbird on Windows 11. 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