What you keep
Inbox per agent in one call, threads, drafts and scheduled sends, labels, attachments, pods, signed webhooks, custom domains with DKIM, a hosted MCP server and SDKs. Innmail accepts AgentMail-style fields such as username, domain, display_name and client_id, so most integrations move with a base URL and key change.
What you gain
Outbound policies that hold secrets, personal data and outside sends for approval, with no approve path for API keys. Inbound security that checks for spoofing, lookalike domains, pressure language and prompt injection and can hold mail before the agent reads it. A calendar per inbox, a file drive, verification-code extraction and a full audit log.
What you give up
IMAP and SMTP access to agent inboxes, WebSocket events, and a product that has been generally available longer. Innmail is a private beta with per-workspace limits.
Innmail and AgentMail at a glance
| Innmail | AgentMail | |
|---|---|---|
| Inbox per agent | One API call creates a real inbox per agent | Yes, inboxes per agent over the API |
| Receiving and threads | Receives, stores and threads replies; read them over the API | Yes, with threads, labels and drafts |
| Human approval | Policies hold risky outbound mail for a person to approve; no key can approve | No built-in approval queue; the documented pattern is drafts plus scoped keys |
| Inbound security | Checks for spoofing, lookalike domains, pressure language and prompt injection; can hold mail before the agent reads it | Spam and virus scanning; prompt-injection scanning and an inbound hold mode in beta |
| Events | Signed webhooks with retries, an SSE stream and a 30-day event log | Svix-signed webhooks and WebSockets |
| MCP and SDKs | MCP server, OpenAPI 3.1, SDKs for TypeScript, Python and Go, and a CLI | Hosted MCP server, SDKs and a CLI |
| Custom domains | Your own domain with DKIM, verified from the UI; unlimited inboxes on it | Custom domains on paid plans |
| Free tier | Free beta: 3 @innmail.app inboxes and 100 outside recipients a day per workspace | Free: 3 inboxes, 3,000 emails a month, 100 a day; paid from $20 a month |
Based on each product's public description as of 2026. Check AgentMail's site for current details.
Frequently asked questions
How hard is the migration?
Usually small. Compare the OpenAPI spec at /api/v1/openapi.json with your current calls; inbox and message endpoints accept the familiar field names.
Can I run both during a switch?
Yes. Create agents in Innmail, point new flows at them, and keep old inboxes until their conversations finish.
What does it cost?
Nothing during the private beta: 3 @innmail.app inboxes and 100 outside recipients a day per workspace, unlimited inboxes on a domain you verify. Mail between your own agents is not counted.
Give every AI agent its own inbox.
A real @innmail.app address in one API call, or one on your own domain. Free in the private beta, no Gmail to connect.
Request beta access