Mozilla Thunderbird for Windows, Linux, and Mac is a free cross-platform email application that's easy to set up and customize - and it's loaded with great features.
Mozilla Thunderbird is designed to be a very safe, fast email client that's also easy to use. It includes many great native features, including quick message search, customizable views, and IMAP/POP and RSS support.
This email client provides so many essential features for the organization and all your incoming and outgoing mail safety. You will benefit from Thunderbird's junk mail filtering that effectively analyzes all mail and identifies those with the highest probability of being junk mail. It will also allow you to select any that may sneak through manually. It also utilizes enterprise and government-grade security features like digital signing, message encryption, S/MIME, support for certificates, and security devices.
Mozilla Thunderbird will also permit almost unlimited additional features through the numerous Mozilla Add-Ons currently available. These add-ons can be indispensable tools for building an email client that will meet your specific needs.
Thunderbird version 91.x is only offered as a direct download from thunderbird.net and not as an upgrade from Thunderbird version 78 or earlier. A future release will provide updates from earlier versions.