Desktop email for Windows, macOS, and Linux
Simple. Secure. Mail.
A local-first desktop email client for Gmail, Microsoft 365, IMAP, and JMAP. Your mail stays on your machine — not on ours.
No S² account required. Connect Gmail, Microsoft 365, IMAP, or JMAP.
Alex Chen
10:24Q3 planning recap
Notes from today, plus the three decisions we locked…
Figma
9:12Invoice · August workspace
Your receipt for S² Mail Design is ready.
Jordan Hale
YesterdayRe: Design review
The reading pane looks right. Let’s ship the light theme.
Microsoft 365
MonShared mailbox access
You were added to finance@acme.com
Nora Patel
SunFollow-up: contract
Did they confirm the start date?
Work · Microsoft 365
Alex Chen
to me · today 10:24
Team — capturing the three decisions from this morning:
1. Keep Classic Inbox as the default.
2. Smart Inbox stays optional.
3. Mail never leaves the machine through us.
Reply · Forward
Works with the mail you already have
The default experience stays close to Gmail: a clear inbox, a reading pane when you want it, and advanced tools that appear only when you ask.
Credentials live in the OS vault. Mail is encrypted on disk. Message HTML is sandboxed. Tracking pixels are blocked unless you allow them.
S² Mail is a client for the accounts you already have. Reading and sending do not require an S² account, and mail is not routed through our servers.
Group personal and work accounts into workspaces. Read one unified inbox, or stay inside a single mailbox — without pretending every provider works the same.
Conversations are rebuilt from Message-ID, In-Reply-To, and References, then merged with provider thread IDs when they exist. Replies pick the right identity automatically.
Local full-text search works offline and without AI. Press Ctrl+K to jump to mail, commands, settings, and shortcuts — keyboard-first, like a desktop app should be.
Keep working without a network. Drafts autosave locally, the outbox is durable, scheduled send is built in, and undo send gives you a moment to take a message back.
Privacy by architecture
A desktop email client that stays on your computer. Installers for every major desktop OS.
