Postbox is described as 'Email application that helps you organize your work life and get stuff done' and is a very popular Email Client in the office & productivity category. There are more than 50 alternatives to Postbox for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Postbox alternative is Thunderbird, which is both free and Open Source. Other great apps like Postbox are Microsoft Outlook, Evolution, eM Client and Spark Mail.
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.
The Bat! is a secure email client software, built to protect your correspondence against third-parties.
Nextcloud Mail is the most popular Self-Hosted alternative to Postbox.
The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.
Dedicated Gmail client with clean integration of Google Calendar, Contacts, Google Drive, and Google Docs, Sheets, and Slides.
aerc is an email client that runs in your terminal. It's highly efficient and extensible, perfect for the discerning hacker.
Mail is designed to let you manage your email quickly and effortlessly. Its interface is based on conversations, so you can read an entire discussion without having to click from message to message.
Unibox is a people centric email client that organizes your messages by person. It avoids having email like a to-do list.
Scribe is a small portable email client with an intergrated contact database and calendar. It supports all the major internet mail protocols and uses international standards where possible. Scribe doesn't required installing or uninstalled and can be used from a removable...
Nylas Mail Lives is a fork of Nylas Mail that fixes many longstanding issues, improves the client experience, and is committed to publish new releases.
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.
No-frills, easy to use, easy to maintain Email client for Android based on the JSON Meta Application Protocol (JMAP).
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