Message Composition

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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.

Not yet rated
12 users
Updated Nov. 6, 2018

RemindIt

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.

Rated 4 out of 5 stars (21)
222 users
Updated Nov. 5, 2018

Automatic Dictionary

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.

Rated 5 out of 5 stars (40)
5,470 users
Updated Nov. 2, 2018

Single Domain

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.

Rated 5 out of 5 stars (2)
278 users
Updated Oct. 29, 2018

Kmaleon Extension Requires Restart

Con esta extensión podrás hacer una copia de tus emails en el programa kmaleon.

Not yet rated
55 users
Updated Oct. 18, 2018

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 4 out of 5 stars (16)
3,543 users
Updated Oct. 11, 2018

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.

Rated 3 out of 5 stars (33)
5,853 users
Updated Oct. 1, 2018

Markdown Here Requires Restart

Write your email in Markdown, then make it pretty.

Rated 5 out of 5 stars (36)
3,228 users
Updated Sept. 30, 2018

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.

Rated 3 out of 5 stars (9)
705 users
Updated Sept. 24, 2018

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/

Not yet rated
59 users
Updated Aug. 31, 2018

Check and Send Requires Restart

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (31)
16,190 users
Updated Aug. 31, 2018

AVIM Requires Restart

Vietnamese-language input method editor (IME). Type diacritics directly into any Web page, Web app, or dialog box. Convenient, comprehensive, secure.
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Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, hộp thoại.

Rated 5 out of 5 stars (41)
53 users
Updated Aug. 31, 2018

Flexible Identity Requires Restart

Selects an identity based on the recipients list when sending an email

Rated 4 out of 5 stars (30)
1,102 users
Updated Aug. 16, 2018

ReplyWithHeader Requires Restart

Outlook style headers and few goodies for Thunderbird & Postbox.

Rated 4 out of 5 stars (17)
3,034 users
Updated Aug. 14, 2018

NestedQuote Remover Requires Restart

Remove nested quotes when replying to a mail.

Rated 3 out of 5 stars (16)
1,841 users
Updated Aug. 9, 2018

Mail Merge Requires Restart Featured

Mass Mail and Personal Mail

Rated 5 out of 5 stars (162)
60,385 users
Updated June 13, 2018

Signature Switch Requires Restart

Switch the signature on/off or choose a new one from your predefined set.

Rated 4 out of 5 stars (200)
63,429 users
Updated May 31, 2018

pCloud for Thunderbird Requires Restart

Easily send large attachments with Thunderbird without leaving your email!

Rated 3 out of 5 stars (5)
33 users
Updated May 29, 2018

ThunderPEC Requires Restart

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.

Rated 5 out of 5 stars (11)
23,654 users
Updated May 16, 2018

Flex Confirm Mail Requires Restart

Confirm mail address and attachments based on flexible rules.

Rated 3 out of 5 stars (5)
15,595 users
Updated May 8, 2018