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Native Windows & Tabs
Multiple macOS windows and tabs with automatic save and restore on launch. Use ⌘+number to jump to a specific tab, and ⌘[ / ⌘] to go back and forward.
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Smart Click Modifiers
⌘+click opens a new tab, ⇧⌘+click focuses it, ⌥⌘+click opens a new window, ⇧⌥⌘+click opens and focuses a new window. While writing an email, ⌘+click or ⌥+click a link to open it in your default web browser.
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Real-Time Inbox Count
Your dock icon and menu bar always show your real inbox count, updated in real time via Fastmail's JMAP push connection. No polling delay. No manual refresh.
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Native Notifications
New email notifications arrive natively through macOS — with a direct delete option, no open window required.
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Default Email Client
One click in Settings ▸ General registers FMail3 as your default email client — no manual steps in System Settings needed. Every mailto: link on the web then opens a pre-filled Fastmail compose window.
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Compose-in-Window Mode
Prefer to write email without your inbox staring back at you? Enable compose-in-window mode for a clean, focused drafting experience.
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Reply With Just Your Selection
Select any text in an email before clicking Reply or Reply All, and only that selection gets quoted — not the whole message. No selection means the normal full quote, exactly as before.
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Masked Email Creation
Easily create a new masked email address directly from within FMail3.
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Deep Links, Hookmark & Linker
Copy a message:// deep link in both Fastmail and Apple Mail RFC-5322 formats, or open any Fastmail link straight back into FMail3 — from the Tools menu or the Terminal. Full Hookmark and Linker support for personal linking workflows.
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Export to PDF
Save any email directly as a PDF from the File menu (⇧⌘P) — clean output with Fastmail UI chrome hidden.
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Attached Files Browser
Browse every attachment across your whole mailbox from one native window (Tools ▸ Show Attached Files, ⇧⌘A), with live thumbnail previews for images and PDFs. Filter by type — PDFs, images, documents, and more — search by filename or sender, and download, print, or QuickLook-preview any file directly from its row. Jump straight to the source email with Show Email. Spam and inline logos/signature graphics are automatically left out.
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Large Attachments via Fastmail Files
Attach a file that's too big to send, and FMail3 automatically uploads it to Fastmail Files, turns on its share link, and adds it to your email — right in the draft you're already writing. A chip shows upload progress and turns into a clickable link once it's done. No manual upload, no new compose window, nothing to copy and paste.
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Text Highlights
Select any text in an email and click Highlight to remember it — it reappears automatically next time you open that email, even after quitting and relaunching. Threads with a highlight get a small marker in the mailbox list, and you can optionally sync a Fastmail tag automatically to any thread with a highlight (Settings ▸ Advanced).
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Export & Import Highlights
Save every highlight you've made to a standalone HTML file (File ▸ Export Highlights…, ⇧⌘E), newest first, with each quote linking straight back to its email in Fastmail — so your highlights aren't locked into FMail3. Bring that same file back in anytime with File ▸ Import Highlights… (⇧⌘I), handy for backups or moving to a new Mac. Want a clean slate instead? File ▸ Remove All Highlights clears everything in one click.
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Toolbar & Appearance
Customize or hide the toolbar with standard shortcuts. Inject your own JavaScript or CSS to tailor the Fastmail experience.
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Auto-Hide & Focus
Lock a toolbar button to hide FMail3 automatically when it loses focus, or set a custom keyboard shortcut to toggle visibility.
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Secure & Private
Sandboxed and notarized by Apple. Not running in your browser means better protection against web tracking. Mouse-over reveals hidden link destinations before you click. No user data collected — ever.
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Lightweight & Modern
Under 10 MB, built with SwiftUI and Swift 6, fully adapted for macOS Tahoe, and regularly updated.
