Mail for Fastmail,
made for the Mac.

Mailpot is a fast, native macOS mail client built on JMAP. New mail arrives the instant it lands, and everything is a keystroke away.

Download for macOS See features

Version 1.0.1 · Requires macOS 26+ · Apple silicon · Fastmail account

Mailpot showing the inbox grouped by date and an open message

Everything you need, nothing you don't

Built in SwiftUI for Fastmail's JMAP API. No web views, no Electron.

Native and instant

A real Mac app on JMAP push. New mail shows up the moment it arrives, with Dock badge and notifications.

Keyboard first

Triage without the mouse. Every action has a shortcut you can rebind, and ? shows them all.

Masked Email

Create, edit and disable Fastmail masked addresses right from the app. Keep your real address to yourself.

Undo Send and Send Later

Take a message back within seconds, or schedule it for the right moment. Drafts save to the server as you type.

Write in Markdown

Compose in plain Markdown and send clean, formatted mail. Search with operators like from: and has:attachment.

Invitations and unsubscribe

Answer calendar invitations right in the message. One-click unsubscribe clears out the newsletters you never read.

Privacy first

Your mail stays between you and Fastmail

Mailpot has no servers, no accounts and no analytics. It talks to Fastmail and nothing else, apart from checking for app updates.

Your token is in the Keychain. The Fastmail API token is stored in your macOS login keychain and never written to disk in plain text.
Your settings are a plain text file. Everything else lives in ~/.config/mailpot/config.json. Read it, edit it, or keep it in Git with the rest of your dotfiles.
Remote images stay blocked. Senders can't see when you open a message until you choose to load images.

~/.config/mailpot/config.json

{
  "markdownByDefault": true,
  "groupByDate": true,
  "loadRemoteImages": false,
  "undoSendSeconds": 10,
  "keybindings": {
    "archive": "e",
    "reply": "r",
    "goToFolder": "g"
  }
}

$ git add .config/mailpot && git commit -m "mailpot"

Give your inbox a better home

Requires macOS 26+ on Apple silicon. Updates install themselves.

Download Mailpot

Version 1.0.1

Mail for Fastmail,made for the Mac.