FMail3 for Mac
Fastmail And FMail3: Bridging The Gap On MacOS.
Free
In English
Version 1.3.4When you purchase through links on our site, we may earn an affiliate commission
FMail3 overview
Email provider Fastmail offers native iOS and Android clients but lacks a dedicated macOS application. While Fastmail’s web interface is excellent, it has one significant limitation: it cannot behave like a native mail application on macOS.
The Problem
The primary issue is that the web interface cannot handle email links (mailto: links) properly. When you click on an email link, macOS defaults to opening the built-in Mail application instead of Fastmail’s web interface—which defeats the purpose if you’re trying to use Fastmail as your primary email client.
The Solution: FMail3
FMail3 represents a modern evolution of FMail2, built in accordance with Apple’s design guidelines. This wrapper application allows Fastmail’s web interface to function more like a native macOS mail client.
What’s new in version 1.3.4
Because of changes in macOS Tahoe, some things are behaving different. This update tries to fix some of them.
Fixed
- Dead forward delete key.
- Compose window closed when navigating to another mail etc. (thank you Bob).
- Not showing notifications for new mail anymore (thank you Birgit).
- Not showing Javascript alerts.
- Compose window sometimes showed wrong content.
Changed
- Refactored CSS script(s) inject.
- Refactored JMAP calls.
FMail3 for Mac
Free
In English
Version 1.3.4
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User Ratings
Jul 17 2025
Version: 1.0.1
Really nice mail client for Fastmail users on Mac OS