What is Inbound?
Open-source email service for developers that turns received mail into webhooks and threaded replies.
Who is Inbound best for?
Inbound is best for developers whose apps or AI agents must receive email, parse it and reply in the same thread.
Support inboxes run by agents
Mail to an address such as support@ reaches your endpoint as JSON, and the answer goes back in the same thread.
Routing by address
Each address, or a catch-all, can point to its own endpoint, such as billing@ to a billing handler.
Moving off Resend
Sending follows Resend's SDK patterns, and receiving, threading and IMAP or SMTP mailbox access sit on the same API.
Many domains
Pro covers 50 domains and Scale has no domain limit, with unlimited mailboxes on every plan.
How much does Inbound cost?
Inbound's hosted plans run from $9 a month for 5,000 emails to $79 a month for 200,000, with unlimited mailboxes on each; the code is free on GitHub under the MIT licence.
- 5,000 emails a month
- Unlimited mailboxes
- Basic support
- 50,000 emails a month
- 50 domains
- Unlimited mailboxes
- 100,000 emails a month
- 300 domains
- Unlimited mailboxes
- 200,000 emails a month
- Unlimited domains
- Unlimited mailboxes
Extra domains cost $3.50 each a month, and extra capacity is $16 a month for each 50,000 received plus 50,000 sent emails. No free hosted plan is listed. The source code is published on GitHub under the MIT licence. Full pricing on inbound.new. We checked these prices on .
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Is Inbound open source?
Yes. Inbound's code is public under the MIT licence, so you can read it, change it and run it yourself.
On GitHub
363stars
- Last commit
- 10 Nov
- Repository age
- 18 months
- Licence
- MIT
- Repository
- inboundemail/inbound
How do I connect Inbound to my AI agent?
Inbound MCP is Inbound's official MCP server. Add it to your agent once, then ask it to create agent mailboxes and handle email through Inbound.
Connects your agent to Inbound, the email service, so you can create mailboxes for agents and let them send, receive and reply to email.
$ claude mcp add --transport http inbound https://inbound.new/mcp
Claude Code connects to Inbound over the web.
Make an API key in your Inbound account and add it where the guide says.
Then ask your agent
- Runs
- On the web
- Sign-in
- API key
- Checked
- Answered 13 Nov
- Guide
- inbound.new
What are the best Inbound alternatives?
Inbound is an open source alternative to AgentMail.
Questions about Inbound
What is Inbound?
Open-source email service for developers that turns received mail into webhooks and threaded replies.
Who is Inbound for?
Inbound is best for developers whose apps or AI agents must receive email, parse it and reply in the same thread.
Is Inbound free?
Not the hosted service: Inbound's plans start at $9 a month for 5,000 emails, and no free tier is listed. The source code is public on GitHub under the MIT licence, so you can run your own copy if you host it yourself.
How much does Inbound cost?
Inbound's paid plans are Default at $9 per month, Pro at $15 per month, Growth at $39 per month and Scale at $79 per month.
Is Inbound open source?
Yes. Inbound's code is public under the MIT licence, so you can read it, change it and run it yourself.
Does Inbound have an MCP server?
Yes. Inbound MCP is Inbound's official MCP server, so agents such as Claude Code, Cursor, Codex and GitHub Copilot can create agent mailboxes and handle email through Inbound. Inbound runs it on the web and it signs in with an API key from your Inbound account.
What are the best Inbound alternatives?
The closest alternatives on Recaply are AgentMail and Nylas.
Where can I try Inbound?
On its official website, inbound.new.
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