Sieve Script Editor

ThunderAI is a Thunderbird Addon that uses the capabilities of ChatGPT, Gemini, Claude or Ollama to enhance email management.

Extensions / Add-Ons for Mozilla Firefox and Mozilla Thunderbird

Browser plugin for Linux to SSO on Microsoft Entra ID using a locally running microsoft identity broker (Intune).

Remove Duplicate Messages

✉️ 📤 "Nextcloud for Filelink" is a Thunderbird extension which makes it easy to send large attachments with Thunderbird by uploading them first to a Nextcloud server and by then inserting the link into the body of your email.

MailExtension to talk to keepassxc

Monterail Full Dark, a Thunderbird theme inspired by the mockup of Monterail

Outlook style headers and few goodies for Thunderbird

This provider add-on adds Google synchronization capabilities to TbSync. Only contacts and contact groups are currently managed, using Google's People API.

Thunderbird add-on that shows the spam score your mail server already assigned to each message, in a colour-coded mail-list column with a rule-by-rule breakdown. Reads SpamAssassin, rspamd, MailScanner, OVH, Sophos and more.

Monterail Dark, a Thunderbird theme inspired by the mockup of Monterail

This addon adds awesome statistics to your beloved Thunderbird!

ThunderSec is a security plugin for Mozilla Thunderbird that creates several pieces of additional security functionality, including DNSBL, RBL, SURBL, DKIM and SPF.

A thunderbird mailextension for explicitely choosing the correct sender identity before opening an email editor.

Thunderbird extension for the Todo.txt application.

BiDi Mail UI: Thunderbird extension for improved right-to-left language support

Thunderbird filelink plugin

Easily export your Thunderbird emails to Joplin.

Source of the Mozilla Thunderbird extension "Correct Identity"