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Mail Merge

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

Rated 5 out of 5 stars (230)
62,486 users

DKIM Verifier Featured

Verifies the DKIM-Signature of an e-mail.

Rated 4 out of 5 stars (48)
19,444 users

Send Later

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

Rated 5 out of 5 stars (264)
94,901 users

Thunderbird Conversations Featured

This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.

Rated 4 out of 5 stars (566)
24,177 users

Signature Switch

Switch the signature on/off or choose a new one from your predefined set.

Rated 4 out of 5 stars (273)
49,973 users

Emoji

Add emojis to your e-mails.

Rated 4 out of 5 stars (64)
23,398 users

Addressbooks Synchronizer

Synchronizes selected addressbooks with other instances of thunderbird
using local files, webdav servers or imap servers

Rated 4 out of 5 stars (81)
23,066 users

Check and Send

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

Rated 4 out of 5 stars (49)
18,519 users

Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (75)
17,478 users

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.

Rated 5 out of 5 stars (49)
3,432 users

AutoarchiveReloaded Featured

Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)

Rated 4 out of 5 stars (26)
22,022 users

FiltaQuilla

Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.

Rated 4 out of 5 stars (100)
15,096 users

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)
20,482 users

Grammalecte [fr] (for Thunderbird)

French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.

Rated 4 out of 5 stars (16)
5,621 users

Allow HTML Temp

Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).

Rated 4 out of 5 stars (89)
10,026 users

G-Hub Lite

Google Tabs for Thunderbird! G-Hub Lite supports Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need Google Workspace support (formerly G Suite)? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (23)
3,548 users

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 (25)
6,884 users

CardDAV Browser

A utility to browse vCards stored on a CardDAV server.

This version is only for Thunderbird. There is a SeaMonkey version available if needed.

Rated 3 out of 5 stars (7)
361 users

Edit Email Subject (EES)

This module allows you to change/edit email subjects

Rated 4 out of 5 stars (125)
7,575 users

ReplyWithHeader

Outlook style headers and few goodies for Thunderbird.

Rated 5 out of 5 stars (93)
10,326 users