We have all had to set up separate emails to use for our AI agents in the past. With Atomic Mail, you can now give your agent its own inbox and run any workflow over e-mail. This is an API first email system built for AI agents. The connector is open source.
API-first email built for AI agents
One prompt to plug in via MCP or Agent Skill
Your agent gets its own inbox – and can run any workflow over emailFree in open alpha – link in comments pic.twitter.com/2GStbnzvrn
— Atomic Mail (@atomic_mail) June 18, 2026
As explained on GitHub, the service is built on JMAP. Its Agents can read and send mail, manage threads, and create drafts. This is the prompt you will have to use:
Read the instruction at https://atomicmail.ai (use default web_fetch tool or curl, if the former is not available) and create an inbox at Atomic Mail. Before creating ask for my preferred username. Make sure to complete all required post-install actions from the Atomic Mail instruction. Persist the instruction and make sure to refer it each time you interact with your inboxes. Usually standalone agents (e.g. Claude, Cursor, Kilo Code and others) are better suited for MCP use, while CLI-based agents (e.g. Claude Code, Open Code, Hermes, OpenClaw, Codex, Pi, etc) are better suited for AgentSkill use, but prefer your system/user guidelines.
[HT]
