ZephyrAB is a hyperscale mail & collaboration platform where privacy is the default, AI works on your terms, and deliverability just works — engineered from the ground up in memory-safe Rust.
Each capability earns its place. Here's what we're building — and why it matters.
Opt in and every message is encrypted to your own key the moment it arrives. We store ciphertext we cannot read.
Smart classification and AI-assisted replies powered by the model you choose — a local LLM or your own provider. Or run it entirely in your browser.
DKIM, SPF, DMARC, ARC, MTA-STS and DANE are built in and automatic — not bolted-on afterthoughts.
Point your domain's nameservers at ZephyrAB and every mail record is created, signed, and maintained for you — forever in sync.
Oversized attachments become secure, expiring download links automatically — with passwords, revocation, and full audit.
Compromised-account detection, outbound scanning, and automatic lock-and-recover keep your domain's reputation clean.
Full groupware — scheduling, shared calendars and address books, and file storage — on open standards, not a walled garden.
A cell-based architecture grows by adding capacity, not by tuning — from your first mailbox to ten million.
JMAP-native with IMAP, POP3, CalDAV and CardDAV support. Provision domains and accounts by API, with delegated admin and SCIM.
Most providers encrypt mail with keys they hold — which means they, and anyone who breaches them, can read it. ZephyrAB does it differently.
ZephyrAB brings AI to the inbox — sorting, prioritizing, and drafting replies — without making you hand your correspondence to a third party you didn't choose.
Getting mail to actually arrive is a science of authentication, reputation, and trust signals. We built all of it into the core.
We don't ship on vibes. Every milestone passes on hard evidence — real tests, real load, real interop — before it counts as done.
The durable core: content-addressed storage, transactional metadata, end-to-end tracing, and a walking skeleton proving mail flows in and out intact.
Full SMTP, the distributed delivery queue, mail authentication, and the independent auditor that guarantees no accepted message is ever lost.
Webmail, calendar and contacts, search, per-user encryption, AI assistance, and managed DNS — the complete experience.
Multi-cell operation, the deliverability center, and the operational hardening that takes ZephyrAB to general availability.
We're building the mail platform we always wished existed — private by default, intelligent on your terms, and engineered to last. Want to hear when it's ready?
Get in touch →