• Development
• Product

Thunderbird Pro November 2025 Update

Welcome back to the latest update on our progress with Thunderbird Pro, a set of additional subscription services designed to enhance the email client you know, while providing a powerful open-source alternative to many of the big tech offerings available today. These services include Appointment, an easy to use scheduling tool; Send, which offers end-to-end encrypted file sharing; and Thundermail, an email service from the Thunderbird team. If you’d like more information on the broader details of each service and the road to getting here you can read our past series of updates here. Do you want to receive these and other updates and be the first to know when Thunderbird Pro is available? Be sure to sign up for the waitlist.

With that said, here’s how progress has shaped up on Thunderbird Pro since the last update.

Current Progress

Thundermail

It took a lot of work to get here, but Thundermail accounts are now in production testing. Internal testing with our own team members has begun, ensuring everything is in place for support and onboarding of the Early Bird wave of users. On the visual side, we’ve implemented improved designs for the new Thundermail dashboard, where users can view and edit their settings, including adding custom domains and aliases. 

The new Thunderbird Pro add-on now features support for Thundermail, which will allow future users who sign-up through the add-on to automatically add their Thundermail account in Thunderbird. Work to boost infrastructure and security has also continued, and we’ve migrated our data hosting from the Americas to Germany and the EU where possible. We’ve also been improving our email delivery to reduce the chances of Thundermail messages landing in spam folders.

Appointment

The team has been busy with design work, getting Zoom and CalDAV better integrated, and addressing workflow, infrastructure, and bugs. Appointment received a major visual update in the past few months, which is being applied across all of Thunderbird Pro. While some of these updates have already been implemented, there’s still lots of remodelling happening and under discussion – all in preparation for the Early Bird beta release.

Send

One of the main focuses for Send has been migrating it from its own add-on to the new Thunderbird Pro add-on, which will make using it in Thunderbird desktop much smoother. Progress continues on improving file safety through better reporting and prevention of illegal uploads. Our security review is now complete, with an external assessor validating all issues scheduled for fixing and once finalized, this report will be shared publicly with our community. Finally, we’ve refined the Send user experience by optimizing mobile performance, improving upload and download speeds, enhancing the first-time user flow, and much more.

Bringing it all together

Our new Thunderbird Pro website is now live, marking a major milestone in bringing the project to life. The website offers more details about Thunderbird Pro and serves as the first step for users to sign up, sign in and access their accounts. 

Our initial subscription tier, the Early Bird Plan, priced at $9 per month, will include all three services: Thundermail, Send, and Appointment. Email hosting, file storage, and the security behind all of this come at a cost, and Thunderbird Pro will never be funded by selling user data, showing ads, or compromising its independence. This introductory rate directly supports Thunderbird Pro’s early development and growth, positioning it for long-term sustainability. We will also be actively listening to your feedback and reviewing the pricing and plans we offer. Once the rough edges are smoothed out and we’re ready to open the doors to everyone, we plan to introduce additional tiers to better meet the needs of all our users.

What’s next

Thunderbird Pro is now awaiting its initial closed test run which will include a core group of community contributors. This group will help conduct a broader test and identify critical issues before we gradually open Early Bird access to our waitlist subscribers in waves. While these services will still be considered under active development, with your help this early release will continue to test and refine them for all future users.
Be sure you sign up for our Early Bird waitlist at tb.pro and help us shape the future of Thunderbird Pro. See you soon!