What it does

AgentMail is an email provider built so that AI agents can have their own inboxes. Developers create inboxes through a REST API, then let an agent send, receive and reply to email with full threading, attachments and multi-party conversations. The site says an inbox gives an agent an address it can use to sign up for services and receive confirmations, and a searchable record of past messages. Real-time events arrive through webhooks and WebSockets. Custom domains are supported with DKIM, SPF and DMARC, and inboxes can also be reached over IMAP and SMTP. Python and TypeScript SDKs and an MCP server are available for integrating with agent tooling, and multi-tenant Pods are offered for platform builders. The site describes a free tier of 3 inboxes and 3,000 emails per month, with no credit card required.

Capabilities

Create inboxes programmatically through a REST API
Send and receive with full threading and attachments
Webhooks and WebSockets for real-time events
Custom domains with DKIM, SPF and DMARC
Python and TypeScript SDKs and an MCP server
IMAP and SMTP access

When to use it

Your agent needs its own address to sign up for services and receive confirmations
You are building a platform where many customers' agents each need separate inboxes
You want agents to hold email conversations and look back at earlier messages