Message Composition

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Clippings

Save frequently-entered text for pasting later.

Rated 4 out of 5 stars (178)
3,098 weekly downloads

Mail Merge Featured

Mass Mail and Personal Mail

Rated 5 out of 5 stars (141)
2,612 weekly downloads

Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (45)
1,972 weekly downloads

Check and Send

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

Rated 4 out of 5 stars (29)
1,149 weekly downloads

SmartTemplate4

SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.

Rated 5 out of 5 stars (49)
878 weekly downloads

Stationery

Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!

Rated 4 out of 5 stars (108)
860 weekly downloads

ThunderPEC

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

Rated 5 out of 5 stars (12)
550 weekly downloads

Markdown Here

Write your email in Markdown, then make it pretty.

Rated 4 out of 5 stars (18)
486 weekly downloads

CategoryManager

Category manager for CardDav contacts, also allows to send an email to all members of a category (categories can be used as contact groups).

Rated 5 out of 5 stars (9)
361 weekly downloads

Email signature for Thunderbird - WiseStamp

Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more

Rated 4 out of 5 stars (2)
360 weekly downloads

AVIM

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 (31)
308 weekly downloads

Send Later Button

A simple button to invoke the (already existing) send later functions.

Not yet rated
278 weekly downloads

Highlighter

Quickly highlight some text in Thunderbird message composing windows.

Rated 4 out of 5 stars (50)
270 weekly downloads

Emoji Menu

Adds the ability to easily insert emojis into your composed messages in Thunderbird.

Rated 5 out of 5 stars (4)
213 weekly downloads

Extra Format Buttons

Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.

Rated 5 out of 5 stars (6)
207 weekly downloads

Consigna para Filelink

Plugin para subir ficheros a Consigna (Junta de Andalucía) de forma automática desde Thunderbird.
Está ideado para el intercambio de ficheros de gran tamaño. Es un espacio de almacenamiento temporal y con algunas restricciones de acceso opcionales.

Rated 3 out of 5 stars (2)
199 weekly downloads

Transliterator No Restart

As-you-type phonetic conversion of text from one alphabet to another, as well as transliteration/detransliteration of selected text anywhere within documents. Supports multiple languages and custom transliteration schemes.

Rated 5 out of 5 stars (77)
196 weekly downloads

CryptoData

Easily and quickly to encrypt / decrypt:
Private messages via e-mail, blogs, social networks, forums, websites, images, etc
Support: Firefox, Thunderbird and SeaMonkey

New feature: CryptoPad (crypto-notepad)

Rated 5 out of 5 stars (6)
173 weekly downloads

Color Text Compose Buttons

Adds Text Color Buttons in Compose Toolbar and More: Pixel FontSize, Strikethough, Sub & Superscript, Lower & UpperCase. Also provide Tools: Insert iframe, Launch MathType, Maths & Greek Symbols, Load Template Variables and Duplicate Compose Window.

Rated 4 out of 5 stars (19)
152 weekly downloads

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 1 out of 5 stars (1)
132 weekly downloads