- CollectionCommunication
- Classificationagent-native
- LicenseMIT
- MCPAvailable
- Agent SkillAvailable
- InterfacesURL onboarding · Agent Skill · MCP · REST · CLI · http · API
- Verified2026-09-30
What it does
Atomic Mail is an AI-agent-first email provider. An agent registers its own username@atomicmail.ai inbox (username 5–21 characters) and then reads, sends, drafts, searches, and threads mail over JMAP (RFC 8620 / 8621). Access is gated by a proof-of-work signup so agents can onboard without CAPTCHAs or human approval. Custom domains are a separate human control plane in the dashboard because they need DNS changes.
Agent-facing interfaces
- Interaction pattern: URL Onboarding ⭐ — the homepage is the join document.
- Catalog protocols: URL onboarding, Agent Skill, MCP, REST, CLI, http, API
- MCP: ✅ Available
- Agent Skill: ✅ Available
- Onboarding type:
url
How agents onboard
Interaction pattern: URL Onboarding ⭐ — the homepage is the join document.
Read https://atomicmail.ai and follow the instructions to create an inbox at Atomic Mail.
See the full onboarding section in the dossier.
Protocol surface
| Interface | Detail |
|---|---|
| Homepage onboarding | https://atomicmail.ai/ |
| Local MCP | npx -y @atomicmail/mcp (homepage) or @atomicmail/mcp-github (GitHub README) |
| Hosted MCP | https://mcp.atomicmail.ai/mcp |
| AgentSkill / CLI | @atomicmail/agent-skill / @atomicmail/agent-skill-github |
| JMAP | RFC 8620 / 8621 mailbox API |
| REST auth | Documented in repo docs/rest-auth.md |
Verification
Last verified 2026-09-30.
Sources:
- https://github.com/Atomic-Mail/atomic-mail-agentic/releases/tag/v0.3.31
- https://atomicmail.ai/