Most email APIs are built around one direction: your app sends a transactional email and a human reads it somewhere else.
That breaks down when the user is an AI agent.
Agents often need the full loop:
So we built Drin: agent-native email infrastructure for developers and AI agents.
The goal is to give an app or agent a real inbox, not just a send endpoint.
A few examples of workflows we are designing for:
The product supports send, receive, inbound parsing, threads, replies, webhooks, CLI, MCP, sandbox testing, and production domains.
Free sandbox is live. Production starts at $3/month.
Site: [https://drin.run/](https://drin.run/)
Docs: [https://docs.drin.run/](https://docs.drin.run/)
I am looking for feedback from people building AI agents, support tools, CRMs, devtools, or anything that needs programmable inbound email. If you have tried to build this with Resend, SendGrid, Mailgun, SES, Gmail, or Postmark, I would especially like to hear what broke first.