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We are on open alpha. The service is 100% free.
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Use @atomicmail.ai or your custom domain
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No identity verification, no credit cards, no domains to configure. Your agent requests a real inbox via API and gets to work instantly.
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Powered by standard JMAP and REST. Cleanly structured so LLMs can generate correct API calls natively, without complex vendor SDKs.
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Built for LLM error recovery. Every API error returns a plain-language hint, allowing your agent to debug and fix its own requests autonomously.
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Each connection is verified with a Proof-of-Work challenge, cheap for one agent, prohibitive for a million. Each agent also earns a reputation score that grows with every successful, non-flagged interaction. Good agents move fast. Bad ones hit a wall.
Via MCP for chat-based agents (Claude Desktop, Cursor, etc.), via AgentSkill for shell-capable agents, or via direct API if you want to manage auth yourself, run outside Node/Deno/Bun, or integrate without MCP/skill wrappers.
Subscribe an agent inbox to dozens of industry newsletters. The agent reads everything, extracts signals, and surfaces only the items that match a user-defined interest profile — once a day, as a digest. Zero noise in the user's personal inbox.
An agent finds job listings, drafts tailored applications, sends them from its own inbox, monitors replies, and escalates to the human only when a recruiter responds with a real opportunity.
An agent inbox receives supplier invoices by email. The agent parses each one, matches it against a PO database, and routes exceptions to a human approver — all without touching the company's main email domain.
Two or more agents communicate with each other over email — a research agent sends findings to a writing agent, which drafts a report and sends it to an editor agent. Email becomes the message bus. The full thread is auditable by any human.
An agent conducts email-based user research: sends structured questions, reads freeform responses, follows up based on what it learns, and summarizes findings. Respondents reply on their own schedule — no scheduling, Calendly, or Zoom.
Subscribe an agent inbox to dozens of industry newsletters. The agent reads everything, extracts signals, and surfaces only the items that match a user-defined interest profile — once a day, as a digest. Zero noise in the user's personal inbox.
An agent subscribes to competitor product update emails, release notes, and press releases. It tracks changes over time, maintains a diff, and alerts the user when a competitor ships something significant.
A support agent owns 'support@' and handles inbound tickets end-to-end: reads the issue, queries internal knowledge bases, and replies with a complete answer. Humans receive only the escalations the agent cannot resolve.
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An agent finds job listings, drafts tailored applications, sends them from its own inbox, monitors replies, and escalates to the human only when a recruiter responds with a real opportunity.
Any agentic pipeline can send its owner a plain email when it encounters an edge case requiring judgment. The human replies in natural language; the agent parses the reply and resumes. This turns email into a universal human-in-the-loop interface.
An agent monitors regulatory sources, receives filings and updates via mailing lists, extracts the relevant changes, and emails a structured briefing to the compliance team. Cheaper than a dedicated compliance SaaS.
Two people or organizations communicate through AI intermediaries — each party has an agent that reads messages, drafts responses for human approval (or sends autonomously with a trust level set by the user), maintains conversation.
Agent-native
Agent-native
Dev-friendly
Traditional ESP
PRIMARY
PRIMARY
SECONDARY
HUMANS FIRST
POW ONLY
VERIFICATION
ACCOUNT + DOMAIN
MANUAL CREATION
FULL JMAP INBOX
REST INBOX API
SEND ONLY
SEND ONLY
JMAP IS IN
TRAINING DATA
MUST LEARN CUSTOM SDK
MUST LEARN CUSTOM SDK
MUST LEARN CUSTOM SDK
hint, docs_url, _next
NO
NO
NO
DEDICATED
DEDICATED
NO
NO
SUPPORTED
NO
NO
NO
YES
YES
NO
NO
JMAP IS AN IETF
STANDARD
PROPRIETARY
PROPRIETARY
PROPRIETARY
JMAP (RFC 8620/8621)
PROPRIETARY REST
PROPRIETARY REST
PROPRIETARY REST /
SMTP
/01
Atomic Mail
PRIMARY
AgentMail
PRIMARY
Resend
SECONDARY
SendGrid, Mailgun
HUMANS FIRST
/02
Atomic Mail
POW ONLY
Agent Mail
VERIFICATION
Resend
ACCOUNT+DOMAIN
SendGrid, Mailgun
MANUAL CREATION
/03
Atomic Mail
FULL JMAP INBOX
AgentMail
REST INBOX API
Resend
SEND ONLY
SendGrid, Mailgun
SEND ONLY
/04
Atomic Mail
JMAP IS IN
TRAINING DATA
AgentMail
LEARN CUSTOM SDK
Resend
LEARN CUSTOM SDK
SendGrid, Mailgun
LEARN CUSTOM SDK
/05
Atomic Mail
hint
docs_url
_next
AgentMail
NO
Resend
NO
SendGrid, Mailgun
NO
/06
Atomic Mail
DEDICATED
AgentMail
DEDICATED
Resend
NO
SendGrid, Mailgun
NO
/07
Atomic Mail
SUPPORTED
Agent Mail
NO
Resend
NO
SendGrid, Mailgun
NO
/08
Atomic Mail
YES
AgentMail
YES
Resend
NO
SendGrid, Mailgun
NO
/09
Atomic Mail
JMAP IS AN
IETF STANDARD
AgentMail
PROPRIETARY
Resend
PROPRIETARY
SendGrid, Mailgun
PROPRIETARY
/10
Atomic Mail
JMAP (RFC 8620/8621)
AgentMail
PROPRIETARY REST
Resend
PROPRIETARY REST
SendGrid, Mailgun
PROPRIETARY REST
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