Mozilla Thunderbird makes emailing safer, faster, and easier than ever before with intelligent spam filters, a built-in spell checker, extension support, and much more. A portable version is also available.
Mozilla Thunderbird is designed to be a very safe, fast email client that's also easy to use. It includes lots of great native features, including quick message search, customizable views, as well as support for IMAP/POP and RSS.
This email client provides so many essential features for the organization and the safety of all your incoming and outgoing mail. You will benefit from Thunderbird's junk mail filtering that effectively will analyze all mail and identify 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 an unlimited number of additional features through the numerous Mozilla Add-Ons that are currently available. These add-ons can be indispensable tools for building an email client that will meet your specific needs.