openagent.email is a self-hosted mail server that gives AI agents unlimited real mailboxes on a domain you own. The stack is two containers: a catch-all Postfix/Dovecot mailbox (docker-mailserver) and a Node/Hono API that matches incoming mail to identities by the To and Delivered-To headers, with an MCP server on top. It idles at about 190 MB of RAM.

Why it exists: agents keep needing to read signup codes and verification links. Hosted agent-mail APIs work, but in a signup flow those emails are the account credentials, and every one of them passes through someone else's servers.

What you get: unlimited anything@yourdomain addresses, scoped per-identity tokens, one-time code and verification link extraction, a long-poll wait call built for automated signups, send rate limits, automatic retention, and a web dashboard for the human.

Apache-2.0, 268 automated tests, four commands to install.

openagent.email is a self-hosted mail server that gives AI agents unlimited real mailboxes on a domain you own. The stack is two containers: a catch-all Postfix/Dovecot mailbox (docker-mailserver) and a Node/Hono API that matches incoming mail to identities by the To and Delivered-To headers, with an MCP server on top. It idles at about 190 MB of RAM.

Why it exists: agents keep needing to read signup codes and verification links. Hosted agent-mail APIs work, but in a signup flow those emails are the account credentials, and every one of them passes through someone else's servers.

What you get: unlimited anything@yourdomain addresses, scoped per-identity tokens, one-time code and verification link extraction, a long-poll wait call built for automated signups, send rate limits, automatic retention, and a web dashboard for the human.

Apache-2.0, 268 automated tests, four commands to install.