Fastmail has introduced official desktop applications for Linux, macOS, and Windows platforms. These apps are built using Electron, which wraps Fastmail’s web client to deliver a more integrated experience with features such as dock badging, desktop notifications, and offline support. The Linux version is accessible through Flathub as a Flatpak package.
While the use of Electron results in a relatively large install size of around 300MB and may lead to a non-native appearance, it offers a consistent and familiar interface for Fastmail users who prefer a standalone application over using browser tabs.
These desktop applications not only provide offline capabilities for email management but also allow users to handle calendar tasks and compose messages seamlessly. Platform-specific integrations include dock/taskbar launching, system notifications, and the ability to set Fastmail as your default email client. Any changes made while offline are automatically synchronized once the internet connection is restored, enhancing user convenience and productivity.

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Fastmail released official desktop applications for Linux, macOS, and Windows built with Electron. The apps provide dock badging, desktop notifications, offline support, and platform-specific integrations like system notifications and default email client settings. The Linux version is available as a Flatpak on Flathub. While the Electron framework results in a 300MB install size and potentially non-native UI, it delivers a consistent cross-platform experience with offline email, calendar, and composition capabilities that sync automatically when reconnected.

Fastmail Launches Desktop App for Linux, macOS, and Windows