Message Composition

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Get before Send

Get messages for the account which is bound to the identity then send the message when you click the toolbar button or the menu item. If your SMTP sever authenticates using POP(IMAP) before SMTP, the extension is useful.

Rated 5 out of 5 stars (2)
1,404 users

CryptoData

Easily and quickly to encrypt / decrypt
For users: private messages via e-mail, blogs, social networks, forums, etc.
For webmasters: websites, images, photos, etc.
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (3)
933 users

hubiC for Filelink

Add hubiC support to Thunderbird's Filelink feature.

Rated 4 out of 5 stars (11)
1,328 users

random(signature)

Updates a given signature file in regular intervals.

Rated 4 out of 5 stars (55)
473 users

SubSwitch

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 4 out of 5 stars (6)
1,303 users

Smart Quotes

Enables “Smart” Quotes for Thunderbird Email

Rated 5 out of 5 stars (2)
107 users

BorderColors GT

How many time you sent an email from your wrong email address?
This add-ons allows you assign a different color to the compose window border for each of your email addresses. So you can immediately view from what account are you writing.

Rated 4 out of 5 stars (7)
3,614 users

PennyPost

This extension makes it very easy to generate and attach stamps to outgoing mail. It also automatically detects and verifies stamps on incoming emails. The MBound algorithm requires a 16MB fixed table to work, HashCash is more CPU intense.

Rated 5 out of 5 stars (2)
20 users

mms Auto Correct

AutoCorrect for the Compose window.

Rated 3 out of 5 stars (25)
682 users

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 5 out of 5 stars (1)
261 users

X-Unsent support

Adds support for the X-Unsent header.

Rated 5 out of 5 stars (1)
29 users

Macro Template No Restart

Macro Template is to replace mail templates with macros for date formatting.

Rated 5 out of 5 stars (1)
245 users

FastCC

A Thunderbird extension that let you switch to cc: with the ALT+CTRL+C keyboard shortcut!

Rated 5 out of 5 stars (1)
130 users

Reply to All as Cc

Send a reply for recipients as CC except the sender, when you do "Reply to All".

Rated 4 out of 5 stars (2)
137 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 (1)
260 users

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 (1)
5 users

HtmlHighlightr

Provides source code highlighting in editor's "Insert HTML" dialog.

Rated 5 out of 5 stars (1)
69 users

Lovebird

Email organized around the people you care about.

Rated 3 out of 5 stars (3)
88 users

Emoji Menu

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

Rated 4 out of 5 stars (1)
515 users

Highlight External Addresses

This extension helps to warn the user when composing a message to a mixed group of people both in and out of the sender's organization. External addresses are highlighted in orange as a reminder.

Rated 4 out of 5 stars (1)
104 users