AI Email Assistant for Thunderbird

Spec sheet

Purpose

A free, open-source Thunderbird extension that adds AI to the email compose window.Read 5 Oct 2026 · github.com

Privacy

The maker says there is no telemetry, analytics, or tracking, and emails are sent only to the AI provider the user chooses.Read 5 Oct 2026 · github.com

License

The project uses the MIT License and is free for personal and commercial use.Read 5 Oct 2026 · github.com

AI integrations

Supported providers are Google Gemini, Groq, OpenAI, Anthropic Claude, xAI Grok, OpenRouter, and Ollama.Read 5 Oct 2026 · github.com

History and styles

The extension stores the last 50 operations locally and allows users to add unlimited custom writing styles.Read 5 Oct 2026 · github.com

Installation

The maker provides a downloadable .xpi file and installation instructions for Thunderbird's Add-ons and Themes menu.Read 5 Oct 2026 · github.com

Key storage

API keys are stored locally and can optionally be encrypted with AES-256-GCM; history is stored locally and never synced to external servers.Read 5 Oct 2026 · github.com

Local option

Ollama runs locally and is described as 100% free, for complete privacy.Read 5 Oct 2026 · github.com

Refinement and access

Users can refine generated text with a comment and access AI actions through the right-click menu or Ctrl+Shift+Space.Read 5 Oct 2026 · github.com

Support and contributions

The maker invites bug reports through GitHub Issues and feature ideas through Discussions, and welcomes pull requests.Read 5 Oct 2026 · github.com

Translation

It translates emails into Polish, English, German, French, Spanish, Ukrainian, and Russian.Read 5 Oct 2026 · github.com

Writing tools

It can rewrite selected text, draft a complete email from a description, and suggest three subject lines.Read 5 Oct 2026 · github.com

Plans and prices

Every AI Email Assistant for Thunderbird plan and price →

Where Specifiction places it

• AI Email Writing Tools#17 of 287.8