Message Composition

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Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 5 out of 5 stars (22)
467 users

Custom Sender Address and Reply Requires Restart

Select sender mail address based on the recipient and reply with the same address

Rated 5 out of 5 stars (2)
17 users

CustomCSS

Allow the user to configure custom CSS that will be added to messages when edited
(new, reply and forward). The custom CSS will be added to a newly created <style>
element in the email's head.

Rated 5 out of 5 stars (4)
161 users

Cypherdog Encryption

Encrypt any file, any text, and share via any medium, any time

Not yet rated
34 users

DL for Thunderbird Requires Restart

Allows to convert large attachments to links automatically without 3rd party providers.

Rated 5 out of 5 stars (7)
60 users

Don't Send Linked Files Requires Restart

Prevents sending of linked files if they are file: URLs.

Rated 1 out of 5 stars (1)
0 users

DS-BCC

Data protection extension, to avoid data mishaps with circular mails:

1. warning for e-mail with multiple recipients not in BCC (exceptions possible)
2. warning for roundmails with a different recipient domain
3. warning if PGP key is present

Not yet rated
98 users

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/

Rated 5 out of 5 stars (2)
2 users

Edit Message Encoding Fallback Requires Restart

Fallback to a safe encoding, if you are replying to a message with unsupported encoding like UTF-16LE. (workaround for the Bug 961983)

Not yet rated
1 user

Email signature for Thunderbird - WiseStamp Requires Restart

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

Rated 2 out of 5 stars (8)
11 users

EML-Editor

Addons to edit EML files and save your emails as EML file with their attachements.

Available on Github with MIT Licence :
https://github.com/pgpgeek/thunderbird-addon-eml-editor

Rated 2 out of 5 stars (1)
623 users

Emoji

Add emojis to your e-mails.

Rated 4 out of 5 stars (62)
23,427 users

Emoji

It permits just with a single click to copy an emoji.
There is a search-box and the "Most used emojis" section (the first one).

If you want to send feedback or report bug, please go to https://github.com/Sav22999/emoji

Rated 5 out of 5 stars (12)
4,889 users

Emoji Menu Requires Restart

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

Rated 4 out of 5 stars (16)
1,169 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 4 out of 5 stars (9)
38 users

EnhancedReplyHeaders

Customizable headers for Thunderbird

Rated 4 out of 5 stars (6)
157 users

Estimez votre CO₂

Estimez votre CO₂ quand vous rédigez un courriel en un simple clic ! Pendant sa rédaction, cliquez sur l'extension afin de connaître l'émission de CO₂e générée par l'ensemble du cycle de vie. Vous aurez aussi accès à différentes équivalences utiles.

Not yet rated
47 users

Ethical signature Requires Restart

Add a button to the email composition toolbar, which lets you insert an ethical signature.

Not yet rated
0 users

Expand mailing lists

Adds an 'expand lists' button to the compose window. It replaces all mailing lists with their contacts.

Rated 5 out of 5 stars (2)
698 users

External Editor Revived

Edit emails in external editors such as Vim, Neovim, Emacs, etc.

Rated 5 out of 5 stars (7)
320 users