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OpenMail

Email API that gives each AI agent its own inbox, real-time replies and attachments as prompt-ready text.

Sources checked

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Pricing
Freemium, in euros. Free has 3 inboxes, 3,000 emails a month and 100 sends a day, with no card. Pro is €9 a month with 10 inboxes, 10,000 emails and 10 GB, then usage-based: €1 per extra inbox a month, €0.001 per extra email and €0.10 per extra GB a month. Enterprise is custom. There are no per-seat charges. Official source 1 ↗
Available as
Web console plus REST API, CLI (npm), TypeScript and Python SDKs, and a hosted MCP server for ChatGPT, Claude, Claude Code, Cursor and VS Code; plugins for OpenClaw and Hermes Agent; LangChain, n8n, Make and the Vercel AI SDK also work. Official source 1 ↗ · Official source 2 ↗ · Official source 3 ↗
Primary group
Automation & Agents

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What it does

OpenMail is an email API for AI agents from UAB All Systems Operational in Vilnius, Lithuania. Each agent gets its own inbox and address, sends mail, and receives replies in real time over a webhook or WebSocket, with PDF, CSV and image attachments turned into plain text for a prompt. It plugs into ChatGPT, Claude, Cursor and other MCP clients through a hosted MCP server. Data is hosted in the EU.

Official source 1 ↗ · Official source 2 ↗ · Official source 3 ↗

Features

  • One inbox per agent. Each agent gets its own address instead of a shared inbox or forwarding rule; inbox-scoped API keys keep an agent from seeing any other inbox. Official source 1 ↗ · Official source 2 ↗
  • Real-time replies. Inbound mail reaches the agent over a webhook or WebSocket, with no polling and no public URL needed for the plugins. Official source 1 ↗
  • Attachments as text. PDFs, CSVs and images can be delivered as plain text ready for a prompt, at additional cost or with your own provider key. Official source 1 ↗
  • Three usage modes. Tool mode sends and reads only when asked, Notify pings you about new mail, and Channel answers incoming mail on its own. Official source 1 ↗
  • Sender rules. Allow or block senders by address or domain, per account or per inbox. Official source 1 ↗
  • Deliverability set up. Every inbox comes pre-warmed with SPF, DKIM and DMARC, and OpenMail manages sending reputation. Official source 1 ↗
  • ChatGPT and MCP access. Listed in the ChatGPT plugin directory; other MCP clients add one hosted URL. You choose scopes, and reading mail is always granted. Official source 1 ↗ · Official source 2 ↗

Pricing & free limits

Pro

€9per month + usage

10 inboxes, 10,000 emails and 10 GB included; then €1 per inbox a month, €0.001 per email and €0.10 per GB a month. Custom domains, no footer, no daily cap, spending limit. Official source 1 ↗

Enterprise

Customcontact sales

Dedicated sending IPs, SSO, volume discounts and priority support with an SLA. Official source 1 ↗

Billing details

No per-seat billing; you pay for usage, not team size. Official source 1 ↗

On Pro, agents keep running past an allowance and overage is billed at the end of the cycle. A spending limit with 80% and 100% alerts is on by default. Official source 1 ↗

Pro is month to month; cancel anytime and keep access to the end of the billing period. Official source 1 ↗

Early-stage teams building AI agents can apply for €500 in usage credit valid for six months on Pro; applications are reviewed by hand. Official source 1 ↗

Free access & limits

Free: 3 inboxes, 3,000 emails a month, 100 emails a day, openmail.sh addresses only, and a footer on sent mail; up to 2 free organizations. Official source 1 ↗

Best for & limitations

Let a browser agent finish signups by receiving OTP codes and verification links in its own inbox. Official source 1 ↗

Run a support inbox where the agent triages and answers mail in-thread. Official source 1 ↗

Forward invoices to an agent inbox and get structured JSON back. Official source 1 ↗

Give ChatGPT its own email address through the plugin directory. Official source 1 ↗

  • Developer setup required. OpenMail is infrastructure: you connect it through the API, CLI, plugins or an MCP client rather than a ready-made mail app. Official source 1 ↗
  • Attachment parsing costs extra. Turning attachments into text is charged separately or needs your own provider key. Official source 1 ↗
  • Free plan send cap and footer. Free accounts can send 100 emails a day, use openmail.sh addresses only, and add a "Sent with OpenMail" line. Official source 1 ↗
  • Assistants receive the mail they read. Mail content a connected assistant reads goes to that assistant's provider, such as OpenAI for ChatGPT, under its own privacy policy. Official source 1 ↗
  • Fully autonomous mode has no human check. In Channel mode the agent answers incoming mail on its own with no human in the loop. Official source 1 ↗
  • Deleting an inbox is permanent. Deleting an inbox removes all its messages, threads and attachments and cannot be reversed. Official source 1 ↗
OpenMail product screenshot
Website previewFixed desktop viewport · 1440 × 900

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