Thunderbird is described as 'Cross-platform email client providing POP/IMAP support, robust filtering, multiple accounts, and chat. Extendable via add-ons with RSS/Atom, etc' and is a leading Email Client in the office & productivity category. There are more than 50 alternatives to Thunderbird for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Thunderbird alternative is K-9 Mail, which is both free and Open Source. Other great apps like Thunderbird are Claws Mail, Evolution, Betterbird and SeaMonkey.
The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible when on the road.
ElectronMail is an Electron-based unofficial desktop client for ProtonMail and Tutanota end-to-end encrypted email providers. The app aims to provide enhanced desktop user experience enabling features that are not supported by the official in-browser web clients.
Wino is a lightweight native mail client for Windows 10/11. It is still in active development. Main motivation for this project is to replace Mail & Calendar for Windows with modern Windows design without using web technologies for speed.
Engineered for iOS, macOS, and watchOS, this fast mail client supports multiple account types, custom actions, Smart Inbox filtering, unified inbox, privacy mode, email scheduling, snooze, third-party app integration, flexible personalization, and advanced workflow tools.
Collaborative email and threaded group chat for productive teams. A single app for all your internal and external communication.
aerc is an email client that runs in your terminal. It's highly efficient and extensible, perfect for the discerning hacker.
Foxmail is a free POP3 and IMAP4 e-mail client in English and Chinese for Windows systems.
Shortwave is an email app that takes the pain out of managing your inbox, making it effortless to stay organized, productive, and responsive.
The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.
LucaMail is an open source, cross-platform email client. LucaMail is developed to provide cross-platform alternative to Email Clients that are really exists. LucaMail focuses on modern technologies as well as maintaining a user-friendly UI.
An enterprise application server that integrates information into a single workspace, integrates also a full mail server
United States
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tried it over a few weeks, all you need for office users