About

Atmosphere Mail is a cooperative SMTP relay for atproto identities. It lets small senders get their transactional mail past Gmail's reputation filters without paying enterprise SaaS prices or handing over their identity to a third-party provider.

§1 · Who we are

The person behind this

Atmosphere Mail is built and operated by @scottlanoue.com — a Washington-based software developer working on open-source infrastructure for the atproto ecosystem.

Freedom in software comes from open source and shared tooling. atproto already provides the portable identity primitive that other protocols still lack; email just needed the plumbing to route around the reputation bottleneck. The relay is MIT-licensed, the Osprey rules live in the open, and the labeler feed is public, so anyone with the source can audit how deliverability decisions are made.

§2 · The entity

Who's on the contract

The relay is operated by Atmosphere Mail LLC, a Washington State limited liability company formed in 2026 to give the project a stable legal counterparty. The LLC exists to sign agreements, hold infrastructure, and absorb liability on behalf of the cooperative — it does not operate for profit.

§3 · How it works

Architecture

Domain ownership is verified via DNS TXT record — the same primitive used by Let's Encrypt and Google Workspace. Each enrolled domain is issued a DKIM keypair (RSA and Ed25519) whose public keys you publish in DNS. The relay signs outbound mail on your behalf, tracks delivery and bounce outcomes, and emits those events to a Trust & Safety rules engine (Osprey) that labels reputation via an atproto labeler. Labels drive throttling, warming, and suspension decisions.

§4 · Source

Open, auditable

The relay, admin UI, Osprey rules, and labeler code all live at tangled.org/scottlanoue.com/atmosphere-mail. Bug reports and patches welcome.

§5 · Contact

Reach us

Operational questions: postmaster@atmos.email. Abuse reports: abuse@atmos.email.