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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 (13)
1 135 gebruikers

FlexConfirmMail

Confirm mail address and attachments based on flexible rules.

(This project was renamed from "Flex Confirm Mail" to "FlexConfirmMail", due to a branding reason.)

Rated 4 out of 5 stars (11)
23 144 gebruikers

StandardTexter

With the help of this Add-on, up to 99 pre-made texts (standard texts, text modules or even signatures) can be stored, which can then be retrieved and inserted when writing an e-mail.
The texts can be preformatted with HTML.

Rated 5 out of 5 stars (9)
1 896 gebruikers

ReFwdFormatter

Remove the ">" prefix from quote when you make a reply.

[Source code] https://github.com/isshiki/ReFwdFormatter

Rated 4 out of 5 stars (15)
2 294 gebruikers

ReplyWithHeader

Outlook style headers and few goodies for Thunderbird.

Rated 5 out of 5 stars (86)
11 615 gebruikers

Copy Address

Copy email address to clipboard.

Rated 4 out of 5 stars (12)
1 781 gebruikers

Check and Send

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

Rated 4 out of 5 stars (49)
22 742 gebruikers

HTML Source Editor

Allows to edit the source of the currently composed message. A simple alternative to ThunderHTMLedit.

Rated 5 out of 5 stars (12)
2 691 gebruikers

Shrunked Image Resizer

Make your photos smaller, so they don't take forever to email.

*Shrunked Image Resizer is no longer maintained.*

Rated 4 out of 5 stars (88)
14 411 gebruikers

Grammar and Spell Checker — LanguageTool

Check your emails for spelling and grammar issues

Rated 4 out of 5 stars (29)
60 914 gebruikers

Textmarker

Highlights selected text when composing emails. Default colour is yellow - other colours are available via Options.
(Works only during writing an e-mail, i.e. only in the compose window.)

Rated 5 out of 5 stars (30)
37 672 gebruikers

Simple Mail Redirection

Allows you to resend (also known as redirect) email messages.
Uses 'cardbook' if installed

Bases on the add-on 'Mail Redirect' by Onno Ekker and Pawel Krzesniak

Please see the support page on how to use and why it sometimes does not work!

Rated 5 out of 5 stars (30)
9 055 gebruikers

Markdown Here Revival

A revival of the popular Markdown-Here addon for Thunderbird 78 and beyond.

Markdown Here Revival is a Thunderbird extension that lets you write emails in Markdown and render them as HTML before sending.

Rated 4 out of 5 stars (17)
1 587 gebruikers

changeQuote

It's an extension that changes the format of reply header.
You can choose between the standard Thunderbird reply header, a detailed reply header or a Customized reply header.
You can configure it in the Tools ->Add-on Preferences -> changeQuote.

Rated 4 out of 5 stars (21)
1 503 gebruikers

FileLink Provider for Dropbox

Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.

Rated 4 out of 5 stars (20)
54 204 gebruikers

Clippings for Thunderbird

Save frequently-entered text for pasting later.

Rated 4 out of 5 stars (8)
1 575 gebruikers

Identity Chooser

Identity Chooser helps you to always use the correct identity when composing a new email.

Rated 4 out of 5 stars (147)
6 456 gebruikers

CategoryManager

Category manager for Thunderbird 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 (23)
8 154 gebruikers

SmartTemplates Uitgesoek

SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.

Rated 5 out of 5 stars (79)
5 513 gebruikers

✨ Awesome Emoji Picker ✨

Modern, nice emoji picker that you can use to find and select emojis. It will be copied to your clipboard or even directly inserted into the e-mail, when you click on it.

You will certainly like it.

Rated 5 out of 5 stars (6)
4 858 gebruikers