Compare email
MachineMail vs OpenMail
Two email tools for AI agents, side by side. Facts come from each tool's own site.
MachineMail
machinemail.devEmail API for AI agents: free inboxes on a shared domain or your own, a trust report on every inbound message, a REST API that follows AgentMail's paths and field names, webhooks and an MCP server.
Visit MachineMail
OpenMail
openmail.shEmail API that gives each AI agent its own inbox and address, with inbound mail delivered as structured data, automatic threading, webhooks, a CLI and a hosted MCP server, and EU data residency on every plan.
Visit OpenMail| MachineMail | OpenMail | |
|---|---|---|
| What it does | Email API for AI agents: free inboxes on a shared domain or your own, a trust report on every inbound message, a REST API that follows AgentMail's paths and field names, webhooks and an MCP server. | Email API that gives each AI agent its own inbox and address, with inbound mail delivered as structured data, automatic threading, webhooks, a CLI and a hosted MCP server, and EU data residency on every plan. |
| In their words | MachineMail: email API for AI agents | The email inbox built for AI agents |
| Open source | No | No |
| Website | machinemail.dev | openmail.sh |
| Link checked | 2026-10-26 | 2026-11-10 |
More options:Alternatives to MachineMailAlternatives to OpenMailGuide: Best email APIs for AI agents
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