Skip to main content


Silence is golden.

Thunderbird Addon: ThunderAI

ThunderAI is a Thunderbird Addon that uses the capabilities of ChatGPT to enhance email management.
It enables users to define custom prompts to analyze, write, correct, and optimize their emails, facilitating more effective and professional communication.
ThunderAI becomes a great tool for anyone looking to improve their email quality, both in content and grammar, making the writing process quicker and more intuitive. There is no need for an API key and is possible to use this extension even with a free account!

Donation Support this addon!
Are you using this addon in your Thunderbird?
Consider to support the development making a small donation. Click here!

Download it from the Mozilla add-on site.
This addon is also opensource: get its code from github.

Would you like to help translate this addon?
Find out how!

Problems or suggestions?
To report a problem or suggest a feature submit a new issue.

Check this page for any known issues in interacting with the ChatGPT web interface.

Thanks to ChatGPT-4 for the help with the icon. ;-)
Thanks to Fluent Design System for the Custom Prompts table sorting icons.