Message Composition

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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)
21,070 users

SmilieInserter Plus

Insert smilies in messages.

Rated 5 out of 5 stars (17)
3,872 users

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)
6,968 users

Mail Merge Featured

Mass Mail and Personal Mail

Rated 5 out of 5 stars (141)
60,799 users

Send Later

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

Rated 5 out of 5 stars (45)
67,614 users

Automatic Dictionary No Restart

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 (21)
3,094 users

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)
3,839 users

Clippings

Save frequently-entered text for pasting later.

Rated 4 out of 5 stars (178)
48,389 users

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)
5,404 users

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)
2,632 users

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 5 out of 5 stars (18)
2,219 users

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)
16,046 users

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)
1,701 users

replyTo

Adds a menuitem to the Mail context Menu to Reply to a different Mailadress

Rated 5 out of 5 stars (7)
385 users

Highlighter

Quickly highlight some text in Thunderbird message composing windows.

Rated 4 out of 5 stars (50)
10,484 users

Markdown Here

Write your email in Markdown, then make it pretty.

Rated 4 out of 5 stars (18)
8,745 users

Check and Send

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

Rated 4 out of 5 stars (29)
24,344 users

Send and Archive

Adds a button to send an email and archive the original message.

Rated 5 out of 5 stars (8)
407 users

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)
43,894 users

EnForward

Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).

This function can be invoked by "Forward to Evernote" in the context menu.

Rated 5 out of 5 stars (5)
2,400 users