MCP.Market

Postbag MCP server

by postbag.dev·dev.postbag/mcp·v0.1.1
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Form backend that routes: one tool per Postbag API operation, plus quickstart and explain.

B77/100grade B
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Safety scan
B77/100

full report

Adoption
New

0 stars29 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Postbag tools

No tool declarations could be read from the package source. They show once the server is installed.

Public scan report

scanner v0.1.10 · 2026-11-01 · same rubric, same numbers if you re-run it

no findings
  • Code scan23 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 42 days ago12/15
  • Maintainer identitynamespace and repository owner differ; GitHub account older than a year; website matches verified namespace7/10
Overall 77/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Postbag compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
77/100
higher than 50% of 48,255 servers
Downloads a week
29
more than 16% of 12,191 servers with a package

Install Postbag in Claude Code, Cursor or VS Code

Runs npx -y @postbag/mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add mcp -- npx -y @postbag/mcp
Add to Cursor

What the publisher says

From the Postbag repository's README, as published. We do not edit it. Read it on GitHub

Postbag

A form backend that routes. Point any HTML form at a Postbag endpoint and it lands in your inbox — then goes wherever it should: email, Telegram, a webhook, a partner, your CRM. Built for people who run many sites, and for the AI agents that build them.

<form action="https://api.postbag.dev/s/fm_8f3kq2" method="POST">
  <input name="email" type="email" required>
  <textarea name="message"></textarea>
  <button>Send</button>
</form>

That's the whole integration for one form. Everything else — grouping forty forms into one stream, mapping their different fields onto one shape, sending that shape to a partner between two dates, a daily digest, never losing a submission — is there when you need it and invisible when you don't.

New here (human or AI agent)? Read CLAUDE.md first.

Why it exists

Every website has forms. Every form needs somewhere to go. Formspree and friends solve "somewhere" for one site; they fall over when you have fifteen sites feeding one partner with fifteen slightly different forms. Postbag is the source of truth for what each form collects, what each downstream system receives, and the versioned contract between them.

The one idea

The database makes it correct; events make it fast.

A submission is accepted the instant it is a row. Delivery is a durable outbox that a worker drains with retries. Realtime nudges are an accelerator, never a transport. If every event stream in the system died, every submission would still arrive — late, never lost. (Inherited from the lead pipeline this generalises; see docs/ARCHITECTURE.md.)

Status

Phase 1 — MVP live at postbag.dev (site, docs, dashboard at /app, API at /v1). See PROGRESS.md for the live blueprint and docs/ROADMAP.md for phases.

Documentation

Start at docs/README.md.

License

The server, dashboard, site and domain packages (apps/*, packages/core, packages/db, packages/auth) are licensed under AGPL-3.0. The client packages that run inside your own code — @postbag/sdk, the postbag CLI and @postbag/mcp — are MIT. Rationale in ADR-006.

Nothing above is checked by us. What we check is on the safety report.

Postbag: common questions

Is Postbag MCP server safe?
Mostly: it is graded B (77/100). Read the Postbag safety report
How do I install Postbag?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Postbag need an API key?
Yes. The registry entry asks for POSTBAG_API_KEY.
Is Postbag maintained?
The last commit was 44 days ago (2026-09-21). The latest release is v0.1.1.
What can I use instead of Postbag?
Servers from other publishers that do the same job: ProxmoxMCP-Plus MCP server.
How does Postbag compare with other MCP servers?
safety score 77/100 (higher than 50% of 48,255 servers); downloads a week 29 (more than 16% of 12,191 servers with a package). Full comparison.

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