For years now, I use Fastmail as my email provider

FMail, the free native Mac application for Fastmail users.

FMail overview

Have a look if you do not use this service and you want to know what it can do for you. Over the years it kept improving and now it is very powerful 1).
For iOS and Android there are native clients, but not for macOS. The web interface used by Fastmail is excellent. The big thing missing for me, is that the web interface cannot react like a native mail application. It can, for example, not handle email links. When you click on such a link it is the macOS Mail application that opens. That is not what we want.

Enter FMail.

Application icon

When you have installed FMail and have adjusted your default email client, an email link will open the FMail client with all provided fields filled.

There are a lot of extra options too. Downloading is handled inside the application and the files are saved in your Download folder (or to another folder of your choice). Want to look up a tracking number? One right mouse click away.
If you use Fastmail from your browser switch to FMail. For free. Guaranteed no tracking of your data. You won't regret.

FMail is a native Mac application, taking little resources on your system. It runs natively on Apple Silicon.

Features

envelope

Default email client

As FMail is a native macOS email client, it handles email links from other programs/documents.
Be sure to set FMail as default email client.

FMail will notify you when it is not the default email client.

bell

Notifications

Notifies you when new mail arrives. Choose the notification sound and select if you want to see the number of unread emails for the Inbox only or for all folders.

FMail small icon

Dock Icon

The Dock icon can show you the number of unread emails. You can set this for the emails in the Inbox or in all relevant folders.

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Run in the background

FMail can run as background application with only a Status Bar menu. It is possible to open FMail via a global shortcut key or from the Status Menu.

Handy: In the Preferences you can define that the FMail window closes when it loses focus.

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Preferences

You can set FMail to your liking in the Preferences (⌘,).
Let FMail work the way you want.

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Secure

Apple wants to keep all software on your computer safe.
Therefore Apple wants that applications are Notarized and Sandboxed. So FMail is notarized and sandboxed.

FMail is written entirely in Swift, a safe modern language.
Another benefit from not running Fastmail in your browser is that FMail protects you from cross-website trackers.

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Extras

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Free Download

Open this page on your Mac to download FMail

FMail runs on macOS 10.14 Mojave and higher
and is notarized by Apple.

With version 2.4.0 FMail has ended its own updating mechanism and now uses the Sparkle library for updates. This can cause side effects when updating from an older version. If you run into such a problem, click the Get FMail button above to get the latest version.

This is a free project. FMail is not tested anymore on systems before macOS 11.0 (macOS Mojave 10.14 is no longer supported by Apple).

If you find FMail useful you could


Disclaimer

If Fastmail decides to change the underlying code, there is no guarantee I can keep FMail alive.

The program is free to use and without any warranty.

1) I have thought of recreating Fastmail as a normal macOS application, like macOS Mail is. The big advantage would be that I am no longer dependent of the way Fastmail is coded for the browser; if the Fastmail developers make a substantial change in that code, FMail could stop working.

In theory rebuilding is possible for the email part by using the JMAP standard.
This would mean a huge amount of work.
Would that result in a better experience than what the web interface of Fastmail offers? I doubt it.
Another non trivial thing is that at the moment the JMAP standard only supports the email part. No option (yet) for the Contacts and Calendar parts.

So there is very little chance I am going to rebuild FMail as an application that is more then a shell around the Fastmail web pages.

2) With the latest version of Fastmail, the theming for the beta version has changed.
Now it is Fastmail that can adjust its theme to the macOS theme (light or dark). If you want auto adjust, you have to select this in the Fastmail Settings → Customise → Preferences → Switch light/dark automatically to match system (So not in the FMail Settings).