Atomic Mail
vs Hostinger Agentic Mail
npx --package=@atomicmail/agent-skill atomicmail register --username "myagent"
# Send a JMAP request inline
npx --package=@atomicmail/agent-skill atomicmail jmap_request \
--ops '[["Mailbox/get", {"accountId": "$ACCOUNT_ID"}, "m0"]]'
# Send a JMAP request from a preset file
npx --package=@atomicmail/agent-skill atomicmail jmap_request --ops-file send_mail.json
# Ask for help
npx --package=@atomicmail/agent-skill atomicmail help
"mcpServers": {
"atomicmail": {
"command": "npx",
"args": ["-y", "@atomicmail/mcp"]
}
}
}
About Atomic Mail and Hostinger Agentic Mail
One is an agent email API. The other is human email hosting with agent features added on top
Atomic Mail is an agent-native email API built on JMAP (IETF RFC 8620/8621), an open standard. Each agent gets a full, live inbox to send and receive, and self-registers through Proof-of-Work — no signup, plan to buy, or domain. Any HTTP client in any language can talk to it, errors are self-documenting, and a dedicated MCP server and AgentSkill ship today. Free during open alpha.
Hostinger Agentic Mail is a set of agent features layered onto Hostinger Business Email, their human mailbox product. It's webhook-first: when mail arrives, it fires a callback your automation can act on, with domain and email allow/block lists and prebuilt skills for tools like n8n and Zapier. Hostinger is a large, trusted brand with strong support and security. But the full API and MCP server are still listed as coming soon, and each agent inbox is a paid Business Email mailbox rather than a programmatically provisioned one.
Atomic Mail vs Hostinger Agentic Mail: Side-by-side
Where a purpose-built agent API diverges from human email with agent features bolted on
Why choose
Atomic Mail?
A real API, today
Full programmatic send, receive, and inbox management over JMAP — not an API still marked "coming soon."
MCP that ships now
A dedicated MCP server is live, so your agent tooling connects today rather than on a roadmap.
An inbox, not a webhook
Agents read threads and reply from a real mailbox, instead of only reacting to inbound callbacks.
Agents register themselves
A Proof-of-Work call provisions an inbox — no human buying a mailbox plan first.
Open standard, zero lock-in
JMAP is an IETF protocol. Your agent code and mailbox aren't tied to one host's platform.
Scales per agent
Give a thousand agents a mailbox without a thousand hosting subscriptions.
Errors that explain themselves
Every error carries a hint, a docs link, and a next step, so agents recover on their own.
Free during open alpha
No card, no per-mailbox fee. Provision as many agent inboxes as you need.
A real API today, not on a roadmap
The difference between shipping the core developer capability and promising it soon
Atomic Mail's whole surface is the API. Your agent talks JMAP over HTTPS to send, receive, search, and manage its inbox right now, with a dedicated MCP server and AgentSkill already available. There's nothing to wait for — the programmatic control is the product.
Hostinger's own page is candid about this: "Full API access is an upcoming feature," and the MCP server is "coming soon." Today you get webhooks and prebuilt skills, which cover common automations but stop short of full programmatic control. If your agent needs to manage its own inbox by API, that capability isn't live yet.
An agent email API, not human email with add-ons
Built from the inbox up for agents, versus features layered onto a mailbox product
Atomic Mail starts from the agent. An inbox is an API object the agent provisions itself with Proof-of-Work — no account, no plan, no human in the loop — and operates over an open standard. The economics match: give a fleet of agents their own mailboxes without a subscription per mailbox.
Hostinger Agentic Mail is built into Hostinger Business Email, its human mailbox product, with agent features added on top. That means a person signs up and buys a plan, and each agent inbox is a Business Email mailbox priced per mailbox. It's a reasonable path if you're already on Hostinger, but the model is human email first, agents second.
Open standard, and free while in alpha
No lock-in, no per-mailbox meter to watch as your agent count grows
Atomic Mail runs on JMAP, the IETF's open mail protocol, so your agent talks a documented standard in any language and can move off the platform freely. It's free throughout the open alpha — no card, no per-mailbox fee — so a thousand agents cost the same as one: nothing.
Hostinger's agent features sit on a proprietary Business Email platform, billed per mailbox — commonly from around $0.39/mo on a long term, renewing higher. Fair pricing for human business email with real brand trust and support behind it, but a per-mailbox subscription is a different model than an agent claiming a free inbox on an open standard.
Developers say it better
Choose Atomic Mail — the agent API that's live today
If your agents need a real programmatic inbox now, on an open standard, that they can set up themselves and run for free during alpha, this is built for exactly that.
- Full API and MCP, live today: not marked "coming soon."
- An inbox, not just a webhook: full JMAP send-and-receive.
- Agents register themselves: Proof-of-Work — no account, no plan to buy.
- Open JMAP standard: IETF RFC 8620/8621, no lock-in.
- Free in open alpha: no card, no per-mailbox fee.
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