New Thread To All Requires Restart
If you always have the same email recipient lists for your projects, this button may be the right thing for you.
It creates a new mail compose window with to, cc, bcc filled with names from the currently viewed email, but empty body, subject.
Help in reminding mails to be answer or sent again. Choose a reminder date for each received or send message that are highlighted in the message list, depending on their status (expired, soon to exprire, to be reminded). Sending a reminder is eased.
Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.
Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.
Kmaleon Extension Requires Restart
Con esta extensión podrás hacer una copia de tus emails en el programa kmaleon.
Custom Address Sidebar Requires Restart
Allow you to help address sidebar more useful.
Nextcloud for Filelink Requires Restart
"Nextcloud for Filelink" is an Open Source Thunderbird extension which makes it easy to send large attachments with Thunderbird by uploading them first to a Nextcloud server and by then inserting the link into the body of your email.
Markdown Here Requires Restart
Write your email in Markdown, then make it pretty.
SubSwitch Requires Restart
Simplify email categorization - it will be easier for you and others to manage mail. Define the set of prefixes for all emails you send or let SubSwitch to autodiscover it. While writing insert prefix to the title - choose one from your set.
EasyRight2Left Requires Restart
Change direction from Left to Right and Right to Left for Persian, Arabic, Hebrew etc. This Thunderbird extension is based on ComposeRTF available in https://addons.thunderbird.net/en-US/thunderbird/addon/composertf/
Check and Send Requires Restart
Check the message contents and addresses before you send the message...
AVIM Requires Restart
Vietnamese-language input method editor (IME). Type diacritics directly into any Web page, Web app, or dialog box. Convenient, comprehensive, secure.
Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, hộp thoại.
Flexible Identity Requires Restart
Selects an identity based on the recipients list when sending an email
ReplyWithHeader Requires Restart
Outlook style headers and few goodies for Thunderbird & Postbox.
NestedQuote Remover Requires Restart
Remove nested quotes when replying to a mail.
Mail Merge Requires Restart Featured
Mass Mail and Personal Mail
Signature Switch Requires Restart
Switch the signature on/off or choose a new one from your predefined set.
pCloud for Thunderbird Requires Restart
Easily send large attachments with Thunderbird without leaving your email!
ThunderPEC Requires Restart
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.
Flex Confirm Mail Requires Restart
Confirm mail address and attachments based on flexible rules.