Scales efficient language processing with open-source accessibility.
357M visits/mo+1%#2 Coding & Development
$9/moStarting price
About MachineMail
MachineMail offers an email API designed for AI agents, providing each agent with its own inbox. Agents can sign up, wait for mail, and reply using real inboxes. The service integrates with MCP clients such as Cursor, Codex, Claude Code, and OpenCode. Each inbox is addressable via a domain, with options for permanent or ephemeral addresses. Messages are delivered as agent-safe text with a trust level, allowing agents to act only on verified content. The platform includes a trust layer that evaluates inbound messages using SPF, DKIM, DMARC, allow/block lists, link and attachment checks, and a classifier. Delivery options include webhooks and MCP, with signed, retried, and replayable notifications. The service supports OAuth and API keys for authentication and offers a free tier covering 3,000 messages per month.
Key features
- Real inboxes for AI agents
- Trust layer with multiple verification levels
- Webhooks and MCP for message delivery
- OAuth and API key authentication
- Custom domains and permanent or ephemeral addresses
- Signed, retried, and replayable webhooks
- Agent-safe text delivery
- Dashboard for monitoring and management
Use cases
- Providing AI agents with dedicated inboxes for receiving and replying to emails
- Filtering and verifying inbound emails before agent processing
- Automating email workflows for AI-driven applications
Pros
- Provides real inboxes for AI agents
- Includes a trust layer to filter and verify inbound messages
- Supports both webhooks and MCP for message delivery
- Offers a free tier with 3,000 messages per month
- Allows custom domains and multiple inboxes per plan
Cons
- No free tier beyond 3,000 messages per month
- Requires integration with MCP clients for full functionality
- Limited to email-related use cases for AI agents
Frequently asked questions about MachineMail
What is MachineMail and what does it do?
MachineMail is an email API designed specifically for AI agents, providing each agent with its own dedicated inbox. Agents can sign up, receive mail, and reply using real inboxes, with messages delivered as agent-safe text accompanied by a trust level.
Who is MachineMail suitable for?
MachineMail is suitable for developers and organizations using AI agents in tools like Cursor, Codex, Claude Code, or OpenCode. It enables agents to interact with email in a secure and automated way.
How does MachineMail's pricing model work?
MachineMail offers a free tier covering 3,000 messages per month. Paid plans start at a higher tier, with no additional fees for inboxes or trust reports. Pricing is based on message volume and plan tier.
What integrations does MachineMail support?
MachineMail integrates with MCP clients such as Cursor, Codex, Claude Code, OpenCode, Copilot, and any other client supporting MCP. It also supports webhooks for pushing mail to external systems.
How does MachineMail handle email security and trust?
MachineMail includes a trust layer that evaluates inbound messages using SPF, DKIM, DMARC, allow/block lists, link and attachment checks, and a classifier. Each message receives a trust level, allowing agents to act only on verified content.
How do I get started with MachineMail?
To get started, create a free account and generate an API key or sign in via OAuth from an MCP client. Agents can register themselves through the auth.md process, receive an inbox, and be claimed into your organization.
