Lambda Mail

Customizable mail client for your Mac.

Join the beta ›

Attachments, where they belong.

Every file waits in a tray under the message. Never between your sentences.

Drop a file into a new email and it lands in the tray, not in your text.

A Lambda Mail reply with a PDF dragged over its text: the window shows Drop to attach, and the message's three files wait in the tray behind it.

Make it yours.

Seven themes to start, or make your own. Change every color, for light and dark. Pick the font, the density and the text size. On macOS 26 and later, turn on Liquid Glass and let your desktop show through the sidebar. Drag the mailboxes you don't use off the sidebar, and put the rest in your own order.

Lambda Mail's Appearance settings with a new theme, Newsprint, made from a copy of Graphite: a serif font, roomy rows, larger text, warm colors and a rust accent, with the main window behind it in the same look.

Private by design.

Your mail takes the short way.

We collect nothing: no analytics, no tracking. Your sign-in stays in the macOS Keychain.

Minimalistic. Fast. Fully customizable.

Built with SwiftUI and AppKit, not a web page in a window. Press Space to preview a file, drag it straight to your desktop, and see new mail on the Dock. Every action has a keyboard shortcut.

Lambda Mail on the desktop as new mail arrives: a notification from Jonah Park, his message at the top of the Inbox, the Dock icon's badge at 4, and a photo from the open message copied to the desktop.

Join the beta

Lambda Mail is in beta for macOS 14 and later. Leave your email and we'll send you an invite.

We'll only email you about Lambda Mail.

Questions

Which accounts does it work with?

Gmail, including Google Workspace. Some Workspace admins turn off app passwords, which the beta uses to sign in. iCloud and Outlook are next.

Do you store my email?

No. It goes from Google to your Mac and nowhere else.

Which macOS do I need?

macOS 14 Sonoma or later.

How much will it cost?

The beta is free. Pricing comes with the launch.

How do I get help?

Write to us from the Support page.