A change was made in Thunderbird 115.0 that rejects the use of the SHA-1 algorithm in digital signatures of S/MIME emails. Read more to learn about this important change, and how it might affect certain users.

We always want to keep our users informed and safe. In light of recent ransomware masquerading as Thunderbird, it’s the right time to review the list of trusted places you can download and install Thunderbird from.

Join us for useful tips and tricks to make your daily remote work more enjoyable and productive. Plus: An inside look at Thunderbird Send!

The Thunderbird team is back from Mozilla’s All-Hands event, and we’re overwhelmed in the most positive way. In addition to the happy and positive vibes we’re feeling from meeting our colleagues in person for the first time, we have a lot of thoughts and impressions to share. Ryan, Jason, and Alex talk about how Mozilla is building AI tools for the good of humanity, and how our perception of AI has changed dramatically.

We’re bringing back monthly Office Hours, now with a Saturday option to make attendance more convenient. Please read the details below to learn how and when you can meet with us to share your feedback and ask questions.

Curious how to get that shiny new “Supernova” look? Here’s a step-by-step guide on activating Vertical Layout, Cards View, and Tags Mode in Thunderbird 115.

The road to Thunderbird 115 “Supernova” has been a long one, and we’re confident you’ll love the final result. If you’re already using Thunderbird 115, you may have noticed a feature that is conspicuously absent: Thunderbird Sync.

Ryan, Alex, and Jason get together to talk about the new features and improvements in Thunderbird 115 “Supernova.” But they also share WHY those features were developed, and what’s being worked on right now. Plus, some breaking news about the future of the Thunderbird Project!

During the next several weeks, you should begin to see your installation of Thunderbird 102 automatically update to Thunderbird 115. Whether you’re upgrading or coming in as a brand new user, now is the perfect time to introduce you to the various elements of the software. This guide will introduce you to the main window of Thunderbird (in its Classic layout and new “Vertical Cards” layout), get you familiar with the terminology, and help you navigate Thunderbird like a pro!

With this year’s version, we’re delivering much more than just another yearly release. Supernova represents a modernized overhaul of the software – both visually and technically – while retaining the familiarity and flexibility you expect from Thunderbird.

We know that many of you use LibreOffice and Thunderbird as part of your daily workflows. So, how can we make them work better together? We reached out on social media to get your feedback.

We asked Jon Hicks, the creator of the original Firefox and Thunderbird logos, to re-imagine his iconic design in light of Thunderbird’s exciting future. 

Last year, our mighty donor base contributed a record-breaking amount in donations to the Thunderbird project. This was a bright, assertive sign that you want to see Thunderbird thriving. Not just in 2023, but decades into the future! 

Mozilla’s Mike Conley joins us to discuss the nostalgia of the early internet, his first task for Thunderbird, and Firefox features that more people need to know about.

Having recently joined us as a full-time Android developer, Wolf brings his passion for building mobile applications to the Thunderbird team. He’ll be helping to bring new features and an updated interface to K-9 Mail as we transform it into Thunderbird for Android. I spoke with him about his first computer, what he hopes to accomplish for the Thunderbird mobile app, and how our community of contributors can help!