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In active development — self-host today

One inbox.
Every device.
Zero third parties.

KyPost is a self-hosted email ecosystem: a server you run yourself, paired with native apps for Android, iOS, macOS, and Linux — built around local AI sorting, PGP encryption, and themes that follow you everywhere.

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KyPost octopus mascot holding an envelope
How it fits together

One server. Every client.

KyPost isn't a single app — it's a self-hosted mail server plus a family of native clients that all pair to it the same way.

SRV

KyPost Server

Runs on your own hardware. Connects to your real mailbox over IMAP/SMTP, classifies unread mail with a local Ollama model, and hands off mail, push, contacts, and PGP key exchange to every paired client.

▼ pairs once via QR code or deep link ▼

Mac & iOS

SwiftUI client that talks only to the relay — pair once, and mail, push, and contacts stay in lockstep with the server.

Android

Kotlin client that is relay-only, just like the Apple client — zero mail credentials ever stored on-device.

Linux

One Qt/Kirigami codebase for Linux Desktop, Plasma Mobile, and Ubuntu Touch — relay-only, just like the Apple and Android clients.

Cross-platform

Plays well with others

Every surface shares the same pairing flow, the same 15 themes, and the same fonts — switching devices never means relearning the app.

Kotlin · Relay

Android

Relay-only, keyword tabs, PGP key signing via QR, MFA push approval.

SwiftUI · Relay

iOS

Pairs to your server once; native inbox, PGP QR key exchange, APNs push.

SwiftUI · Relay

macOS

Same codebase as iOS — three-pane view, pop-out readers, menu-bar shortcuts.

Qt / Kirigami · Relay

Linux Desktop

KDE Plasma sidebar layout, built from the same shared components as mobile.

Qt / Kirigami · Relay

Plasma Mobile

Same mobile UI root as Ubuntu Touch — bottom tabs, swipe-to-archive and delete.

Qt / Kirigami · Relay

Ubuntu Touch

Packaged as a Click for OpenStore, pixel-identical to Plasma Mobile.

Go + React · Server

Web

The server's own browser UI — config, logs, compose, and every theme, no install required.

PWA · Installable

Progressive Web App

Install the same web UI to your home screen or dock — service worker and manifest included, no app store needed.

Every client is relay-only: you pair once via QR code or deep link, and mail, push, and contacts flow through your own KyPost Server from then on.

Privacy by default

Encrypted when you can be, protected when you can't

KyPost layers PGP encryption on top of a self-hosted core, and never falls back to sending plaintext when it doesn't have to.

01 — In person

PGP, verified face to face

Scan a contact's public key with your camera, confirm their fingerprint out loud, and every message to them is encrypted end-to-end from then on — Android and Mac/iOS both support this today.

02 — No key on file

Secure pickup, not plaintext

If a recipient doesn't have a PGP key yet, KyPost never sends the message body in the clear. It emails them a login link instead — the real content only unlocks after they sign in to the server.

03 — Under the hood

Your server, your rules

Mail lives on infrastructure you control, and unread-mail classification runs on a local Ollama model — no cloud AI provider ever sees your inbox.

Make it yours

Categories, rules, and 15 themes — shared everywhere

Every client speaks the same theme language, so the way you sort mail and the way it looks travels with you.

Categories

Unread mail is auto-labeled by a local AI model and sorted into keyword tabs — no manual filing.

Rules

Tune the classifier's prompt per user to change what counts as which category, right from the web UI.

Themes

15 palettes, from Patina Ky to Cyber Punk, defined once and shared byte-for-byte across web, Android, Mac, iOS, and Linux.

Filtering

Inbox rules run as an expanded Sieve script on your own server — write a condition once and every client sees the same filtered result.

Notifications

Pick your delivery path per device: Firebase, APNs, or UnifiedPush for instant push, or plain client pull if you'd rather trade a little immediacy for a lot more privacy.

Scroll to preview the shared theme system — starting from the default, Patina Ky

KyPost web inbox in the Patina Ky theme Patina Ky
KyPost web inbox in the Cyber Punk theme Cyber Punk
KyPost web inbox in the Ocean theme Ocean
KyPost web inbox in the Forest theme Forest
KyPost web inbox in the Sun theme Sun
KyPost web inbox in the Polished Ky theme Polished Ky
The repos

Four projects, one ecosystem

Everything is open source and under active development. Star, clone, or self-host any piece today.

KyPost Server

Go · React · Docker
Available Now — Early Beta

Self-hosted IMAP/SMTP web client with local-AI keyword labeling, multi-user roles, push relays for mobile, and a dozen+ shared themes.

View on GitHub

KyPost for Android

Kotlin
Currently Testing

Native, relay-only email client with keyword inbox tabs, PGP key signing via QR, and MFA push approval.

View on GitHub

KyPost for Mac & iOS

SwiftUI
Currently Testing

One SwiftUI codebase for macOS and iOS — relay-only, with PGP QR key exchange, contact sync, and APNs push.

View on GitHub

KyPost for Linux

Qt · Kirigami
In Development

One Qt codebase, two UI roots — Linux Desktop, Plasma Mobile, and Ubuntu Touch, with UnifiedPush notifications.

View on GitHub