Mail infrastructure for AI agents, built in Germany.
Agents can reason, browse, and act — but most still have no durable way to communicate. Dairo gives every agent a real, persistent mail identity: an inbox it owns, an address it can be reached at, the ability to send real physical letters, and an API built for how agents actually work.
Email is still the universal protocol. Agents deserve a first-class email layer.
Every business runs on email. It is the one address that works across every company, every vendor, and every human — no integration required. As software agents start doing real work, they hit the same wall a new employee would without a mailbox: no way to receive a confirmation, follow up on a thread, or be reached later.
SMTP and IMAP were designed for human inboxes and desktop clients decades ago. They were not built for agents that create identities on demand, send and receive at machine scale, and need structured, programmable access to everything. Dairo is the email layer rebuilt around that reality — one API, real inboxes, and delivery events you can act on.
Built in Germany, for developers.
Dairo started from a simple frustration: wiring agents up to email meant gluing together SMTP relays, IMAP polling, webhook plumbing, and deliverability tooling that was never meant to talk to a program. The primitives existed, but nothing was designed for an agent to own an inbox and reason over it through an API.
We are a German company building for EU developers and the wider world. We care about doing this honestly — clear pricing in EUR, GDPR-aligned data handling, and an infrastructure story we are willing to write down in full rather than gloss over. If something is on the roadmap, we say it is planned rather than pretend it already ships.
How we build.
Build for scale
Never the small version. The same code path has to be fast and correct at 10 inboxes and at 10 million — dispatchers, queues, and autoscaling workers, not shortcuts that fall over under load.
Honest by default
We describe what Dairo actually does, including where it runs and what that means legally. Roadmap items are labelled as planned, not dressed up as shipped.
Developer-first
One clean API, nine SDKs, a CLI, and native MCP. Inboxes in seconds, predictable behaviour, and docs written for the person actually wiring it up.
Ship
We move quickly and put real things in front of people. Tight feedback loops beat long roadmaps that never reach production.
The honest version of our infrastructure.
Plenty of vendors market "sovereignty" they can't actually deliver. We would rather tell you exactly how Dairo runs so you can make your own call.
A German company, EU-focused
Dairo is operated by a German legal entity. We build in Germany and design for EU developers, with GDPR-aligned data handling and billing in EUR. The data controller is an EU/German entity — the operator named in our Impressum.
Built on AWS, with named subprocessors
We run on AWS, with Supabase, Polar, and Vercel as core subprocessors and Amazon SES for email delivery. Our Privacy Policy lists each one and what it processes, so there are no hidden third parties.
US legal process can apply — we don't pretend otherwise
Some processing happens in the United States, and several subprocessors are US-incorporated, so US legal process including the CLOUD Act can apply. We don't claim immunity from it. For the full residency picture, see our Privacy Policy and machine-checkable compliance posture.
Closing the gap is on the roadmap
Stronger guarantees — customer-managed keys and field-level encryption for provider-opaque data — are planned, so that even compelled subprocessors can't read sensitive fields. Until that ships, we describe the exposure plainly rather than market around it.
This mirrors our /v1/compliance residency assertion exactly: EU/German controller, AWS · Supabase · Polar · Vercel · SES as subprocessors, and CLOUD Act exposure acknowledged. Read the Privacy Policy.
Give your agent an email address.
Create inboxes in seconds, send and receive email at scale, send real physical letters, and stream live delivery events — one API, nine SDKs, a CLI, and native MCP.