Machine Inbox MCP server
Task-scoped email inboxes for AI agents: read mail, extract verification codes, and reply.
Little public usage data yet
Reviews
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If you have run it, two minutes of your experience saves the next person an afternoon.
Machine Inbox tools (11, 4 write)
write = sends, deletes, buys or postscreate_inboxwrite actionFreeRequest a new paid inbox. Buying requires an out-of-band payment (Stripe MPP or x402 USDC on Base); this tool returns the live HTTP 402 payment challenge plus exact instructions to complete the purchase. Standard inbox: $2.00.
delete_inboxwrite actionFreeDelete an inbox: revokes the token and erases stored mail.
delete_webhookwrite actionFreeRemove the inbox webhook.
get_inboxFreeRead an inbox: address, status, expiry, limits, and usage.
get_messageFreeFetch one message with parsed text, HTML, and attachment download URLs.
get_service_infoFreeRead the Machine Inbox service instructions: pricing, payment rails, endpoints, and limits.
get_verification_codeFreeExtract the newest one-time verification code or confirmation link from inbound mail. Ideal for signup and login flows.
get_webhookFreeRead the inbox webhook state: URL, delivery counters, and whether it is disabled. The secret is only returned by set_webhook.
list_messagesFreeList messages in an inbox, newest first. Pass after=<newest createdAt seen> to poll for only new mail.
reply_to_messagewrite actionFreeSend an included plain-text reply to the authenticated sender of an inbound message.
set_webhookFreeRegister or replace the inbox webhook: an HMAC-signed POST fires on every inbound message with metadata, extracted verification codes, and injection risk (never the body). Returns the signing secret.
Public scan report
scanner v0.1.9 · 2026-09-22 · same rubric, same numbers if you re-run it
- –Code scanremote-only server, no package to scann/a
- Live reliabilityremote reachable in 1044ms20/20
- Tool poisoning11 tool descriptions checked15/15
- Auth qualityopen endpoint exposes 4 write-action tools with no auth3/15
- Maintenanceno repository listed3/15
- Maintainer identityverified namespace with website, no repo4/10
Findings (2)
- highWrite-action tools reachable without authentication
auth.open-write - lowNo source repository listed
maint.no-repo
Install directly
claude mcp add --transport http machine-inbox https://machineinbox.com/mcp
Machine Inbox: common questions
- Is Machine Inbox MCP server safe?
- With care: it is graded C, so read the findings first (60/100). Read the Machine Inbox safety report
- How do I install Machine Inbox?
- It runs remotely at machineinbox.com. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
- Does Machine Inbox need an API key?
- Not as far as the registry entry and our scan can tell: no credentials are declared or required.
- Is Machine Inbox maintained?
- The latest release is v0.1.0.
- Is Machine Inbox up?
- 100% of our last 20 checks got an answer. We check remote servers about four times a day.
- What can I use instead of Machine Inbox?
- Servers from other publishers that do the same job: Atomic Mail MCP server, smbCloud Mail & Auth MCP server and EmptyInbox MCP server. Compare all Machine Inbox alternatives.
Alternatives to Machine Inbox
Same job from other publishers: the closest match first, then the best rated.
- Atomic MailProgrammable email inbox for AI agents — JMAP, PoW auth, stdio MCP server.not reviewedEstablishedA
smbCloud Mail & AuthEmail infrastructure and authentication for developers: domains, inbox routes, auth apps, deploys.not reviewedGrowingA- EmptyInboxZero-config disposable email inboxes for AI agents: create, read mail, await verify codes.not reviewedGrowingB
PostfleetGive an AI agent its own email address: send, reply, read, and wait for mail.not reviewedGrowingA- MCPUnlimited agent mailboxes — create identities, read/wait for mail, extract OTPs, send email.not reviewedGrowingB
