Postbox Alternatives for Linux
Postbox is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The most popular Linux alternative is 
Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Postbox and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Postbox are 
Mailspring (Freemium, Open Source), 
Evolution (Free, Open Source), 
Geary (Free, Open Source) and 
Claws Mail (Free, Open Source).
- Shift is an email client that makes navigating between Mail, Calendar, Drive + your favorite Apps & Extensions easy (for Gmail, Outlook.com - Office 365 & Hotmail). View 47 alternatives to Shift
Shift
Sponsored - Free email application that’s easy to set up and customize - and it’s loaded with great features!. View 85 alternatives to Thunderbird
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- PortableApps.com
- Haiku
- Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more. View 37 alternatives to Mailspring
- Freemium • Open Source
- Mac
- Windows
- Linux
- Arch Linux
- Fedora
- Ubuntu
- Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. View 56 alternatives to Evolution
- Free • Open Source
- Linux
- BSD
- S/MIME
- GNOME
- OpenPGP
- Geary is an email application built around conversations, for the GNOME 3 desktop. View 47 alternatives to Geary
- Free • Open Source
- Linux
- Chrome OS
- BSD
- GNOME
- Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive... View 78 alternatives to Claws Mail
- Mutt is a small but very powerful text-based mail client for Unix operating systems. View 51 alternatives to MuttNo screenshots yet
- Free • Open Source
- Mac
- Windows
- Linux
- Xfce
- KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. View 53 alternatives to Kontact - KMail
- Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). View 42 alternatives to Sylpheed
- Shift is an email client that makes navigating between Mail, Calendar, Drive + your favorite Apps & Extensions easy (for Gmail, Outlook.com - Office 365 & Hotmail). View 47 alternatives to Shift