Email inbox API that gives AI agents their own addresses to send, receive, and manage real conversations
AgentMail is an email API built for AI agents instead of people. You create a real inbox with a single API call, and your agent can then send, receive, thread, label, and search email using an API key rather than OAuth. Incoming mail arrives as structured JSON through webhooks or websockets, so agents can act in real time instead of polling. It suits developers building support, recruiting, sales, scheduling, or document-processing agents that need their own identity and a persistent conversation history.
AgentMail is an email inbox API for AI agents. Instead of sharing a human's mailbox, each agent gets its own real, persistent email address created through an API call, with full send, receive, threading, and search support.
The Gmail API reads a human user's mailbox and requires an OAuth flow tied to a Google account, plus it enforces rate limits that assume a person is typing. AgentMail provisions a dedicated inbox per agent with a simple API key and is designed to scale to thousands of agent identities in one organization.
Those are transactional APIs optimized for outbound sending. AgentMail is built around the inbox, so your agent can receive replies, maintain threads, and hold an ongoing two-way conversation rather than firing off one-way messages.
There is a free tier with 3 inboxes, 3,000 emails per month, and 3 GB of storage with no credit card. Developer runs $20/month for 10 inboxes and 10,000 emails, Startup is $200/month for 150 inboxes and custom domains, and Enterprise is custom priced. Check the official pricing page, since limits have shifted over time.
Webhooks and websockets deliver inbound messages in real time, with signed webhooks so you can verify they came from AgentMail. No polling required.
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