Mozilla Thunderbird

About

Thunderbird is a free email and productivity app available for macOS. It gives you access to your messages, calendars, and contacts in one app, and you can manage all your accounts separately or in a unified inbox. You can also filter and organize your messages the way you like, including tagging important items so you can find them quickly.

Thunderbird is clean and elegant by default, and it can be customized to match your workflow and visual preferences. It is open source and funded by user donations. The developers say they don't collect personal data, sell ads in your inbox, or train AI with your private conversations. Thunderbird is part of the Mozilla family, and it is free forever.

Thunderbird Mobile is also available, so you can send and receive your most important messages anywhere. The app is described as open source and secure, and as respecting your privacy.