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.)

Identity Chooser

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

Emoji

Add emojis to your e-mails.

Emoji Menu Reinício necessário

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

FileLink Provider for Box

Uploads your large attachments to your Box instead of sending them by email.

Automatic Dictionary

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.

Mail Merge

Create and Save or Send Multiple Individual and Personalized Messages from a Draft

Shrunked Image Resizer

ReplyWithHeader

Outlook style headers and few goodies for Thunderbird.

Clippings for Thunderbird

Save frequently-entered text for pasting later.

InsertSignature

Insert signature helps you to insert usually used text by your customization.

*cloud - FileLink for Nextcloud and ownCloud Em destaque

Upload large attachments to your Cloud and send the link by email

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.

Simple Mail Redirection

Permitir redirecionar as mensagens de correio (aka "repostagem") para outros destinatários.

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).

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.)