About Mailsnail
The way AI agents send physical mail.
Why we built this
Agents already have phones (Twilio, etc.), email, code execution, web browsing, and shells. The one channel they couldn't reach was the most physical one: a real envelope, in a real mailbox, postmarked by USPS.
Mailsnail closes that gap. It's an MCP server that exposes a small set of well-typed tools — send_letter, send_postcard, get_mail_status — and runs the actual print, fold, stuff, stamp, and handoff to USPS behind the scenes.
Who it's for
- Developers building agents who need physical mail as a tool: thank-you notes, legal notices, customer outreach, anything that arrives in a hand.
- Teams replacing batch direct-mail workflows with agents that decide, write, and send — autonomously and one piece at a time.
- Curious tinkerers who want their AI to mail them a birthday card.
How we think about distribution
We build for agents first. The site has llms.txt, llms-full.txt, an OpenAPI spec, and a /setup page that returns ready-to-paste MCP config for every major client. If a model lands here cold, it should be able to wire itself in without human help.
Get in touch
Email us at hello@mailsnail.dev. We're a small team and we read everything.