How do I install Mailsnail?

Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Mailsnail need an API key?

The publisher lists these environment variables: MAIL_PROVIDER, MAIL_API_BASE_URL, CLICK2MAIL_USERNAME, CLICK2MAIL_PASSWORD, LOB_API_KEY, MAIL_MCP_ALLOW_LIVE, MAIL_MCP_SPEND_CAP_USD.

What transport does Mailsnail use?

Mailsnail is reached over HTTP.

When was Mailsnail last checked?

Last checked 2026-11-09. Send USPS letters & certified mail from any agent. Hosted: sign in, no install.

Mailsnail MCP server

Power your agent

Add this server

The publisher's own URL. Not a PlugMCP endpoint.

Add to Cursor Add in Claude Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Server URL

https://api.mailsnail.dev/mcp

Credentials from the publisher

MAIL_PROVIDER — For self-hosting only; most people should add the hosted URL instead. 'click2mail' (your own account) or 'lob' (your own key). 'managed' needs a Stripe Shared Payment Token that most AI apps can't create.
MAIL_API_BASE_URL — Hosted Mailsnail backend. Required when MAIL_PROVIDER=managed.
CLICK2MAIL_USERNAME — Click2Mail account username. Required when MAIL_PROVIDER=click2mail.
CLICK2MAIL_PASSWORD — Click2Mail account password. Required when MAIL_PROVIDER=click2mail.
LOB_API_KEY — Lob API key. Required when MAIL_PROVIDER=lob. test_* is free; live_* actually mails.
MAIL_MCP_ALLOW_LIVE — Set to '1' to actually mail in BYOK modes. Default '0' is dry-run.
MAIL_MCP_SPEND_CAP_USD — Per-session estimated spend cap. Server refuses sends past this.

The Claude button above opens Claude with the name and URL filled in. You still confirm it there.

shClaude Code

1claude mcp add --transport http io.github.iancollins27-mailsnail https://api.mailsnail.dev/mcp

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "io.github.iancollins27-mailsnail": {4      "command": "npx",5      "args": [6        "-y",7        "mcp-remote",8        "https://api.mailsnail.dev/mcp"9      ]10    }11  }12}

claude_desktop_config.json

Remote · HTTPPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Remote

Transport: http

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

Mailsnail

Open-source, provider-agnostic physical mail for AI agents.

Agents have every channel except one. They can email, text, call, and post to every feed — but until now, putting a real, postmarked envelope in a mailbox meant a human signing up for a print-provider account, provisioning API keys, and wiring billing. Mailsnail closes that gap:

Nothing to install. Add one URL to Claude, ChatGPT, Cursor or any MCP client and sign in. Pay for one letter by card or fund a balance, priced at our cost: from $1.21 first-class and $8.61 certified, no subscription. Agents that can mint a Stripe Shared Payment Token can also pay per piece with no account, over the Machine Payments Protocol (HTTP 402).
No lock-in, ever. The provider layer is open and swappable: bring your own Click2Mail or Lob account, self-host the whole gateway, or chain providers for failover. The managed service is a convenience, not a cage.
Built for compliance mail. Certified letters with extra_service: "certified" — the mail that legally must be physical (preliminary lien notices, legal notices) and must not miss its deadline because one print API had a bad day.

claude mcp add -t http mailsnail https://api.mailsnail.dev/mcp
# then /mcp → mailsnail → Authenticate, and: "Mail a thank-you letter to my aunt."

In Claude Desktop or ChatGPT, add https://api.mailsnail.dev/mcp as a custom connector. Steps for every app: mailsnail.dev/setup. Running your own Click2Mail or Lob account instead? See Ways to run it.

Hosted connector and plugins

The quickest start needs no install. Add https://api.mailsnail.dev/mcp as a custom connector in Claude, ChatGPT, Cursor or any MCP client that supports remote servers, then sign in. Each app's setup steps are at mailsnail.dev/setup.

plugins/mailsnail packages that connector with skills for sending letters, sending certified mail and tracking mail. It works in Claude (chat, Cowork and Claude Code) and in Cursor. To install it in Claude Code:

/plugin marketplace add iancollins27/mailsnail
/plugin install mailsnail@mailsnail

Packages

Package	What it is
`mailsnail`	MCP server — 11 tools (`doctor`, `verify_address`, `preview_letter`, `send_letter`, `send_postcard`, `get_balance`, `top_up`, `get_letter`, `get_postcard`, `list_letters`, `cancel_letter`) over any provider below. Works in Claude Code, Claude Desktop, Cursor, Codex CLI, OpenAI Agents SDK.
`@mailsnail/core`	Provider-agnostic core: adapters (Click2Mail, Lob, any Mailsnail gateway), multi-provider failover router, request validation. Zero dependencies.
`@mailsnail/gateway`	Self-hostable REST API: BYO provider credentials, `body_text`→PDF rendering, proofs, invocation logging. The managed service at `api.mailsnail.dev` runs the same wire protocol.
`spec/`	The provider-neutral mail-piece schema + the failover-safety contract. Implement it and anything — including a print shop — becomes a Mailsnail-compatible node.

Ways to run it

Mode	Credentials	Paying	Good for
hosted connector (`api.mailsnail.dev/mcp`)	none; you sign in	you, per letter by card or from a balance	people in Claude, ChatGPT, Cursor; zero-setup
managed (stdio default)	none	agent, per piece (Stripe SPT)	agents that can mint an SPT
gateway	your own, on your server	your provider account	teams; PII stays in your infra
click2mail / lob (BYOK)	yours, local env	your provider account	direct control, one provider
failover chain	yours, per provider	your provider accounts	mail that must not miss deadlines

Failover is deliberately conservative: a send moves to the next provider only when the failed provider guarantees nothing entered production and no money moved (safeToRetry — see the spec). A duplicate certified letter is worse than an error.

Running behind an egress proxy or allowlist

Sandboxed agents — CI runners, enterprise agent platforms, hosted agent sessions — usually sit behind an egress allowlist, and that is the environment managed mode is for. Two minutes of setup:

npx mailsnail doctor      # says exactly what it can and can't reach, and why. Free; never mails.

Allow this host:

Mode	Host to permit	Port
managed (default)	`api.mailsnail.dev`	443 (TCP / HTTPS `CONNECT`)
self-hosted gateway	whatever `MAIL_API_BASE_URL` points at	its port
click2mail (BYOK)	`rest.click2mail.com`	443
lob (BYOK)	`api.lob.com`	443

Allowlist by hostname, not IP: the managed gateway runs on managed infrastructure and its addresses change without notice. If your policy is IP-only, self-host @mailsnail/gateway on an address you control — that escape hatch is the whole point of the open provider layer.

Through an HTTP proxy. Node's fetch ignores HTTPS_PROXY unless you tell it not to, so an allowlisted gateway can still time out silently. Either:

export NODE_USE_ENV_PROXY=1        # Node >= 22.21
export HTTPS_PROXY=http://proxy.example:8080

or install undici alongside mailsnail (npm i undici) and Mailsnail routes through HTTPS_PROXY/HTTP_PROXY/ALL_PROXY itself, honoring NO_PROXY. mailsnail doctor tells you which of these is actually in effect.

TLS-inspecting proxy? Point NODE_EXTRA_CA_CERTS at your organization's CA bundle.

When it's blocked anyway, the failure says so instead of guessing: transport errors carry a code of unreachable, egress_blocked, or tls_untrusted, plus the exact host:port to permit. Any of those codes means the request never reached the backend — nothing mailed, nothing was charged, and the fix is network policy, not your account.

Safety

Dry-run by default everywhere; live mail requires an explicit MAIL_MCP_ALLOW_LIVE=1.
Per-session spend caps in the MCP server; auto-refund in managed mode when a paid piece fails to mail.
preview_letter returns a proof PDF and exact price before anything is charged — show it to your user first.
Don't use this for spam, harassment, or fraud. Provider terms and USPS regulations apply; managed mode enforces its own abuse screening.

Why open source

You're letting software put paper in mailboxes and spend money doing it. Read the code. Run it yourself with your own provider account for free. Use managed mode when you'd rather not hold credentials at all. If we ever disappoint you, MAIL_PROVIDER=click2mail and your mail keeps moving — that's the deal, and it's enforceable because this repo exists.

Status

Early. US-only today. Letters, certified letters, and postcards. The managed API, MCP server, self-host gateway, and Click2Mail/Lob adapters are live; additional adapters (PostGrid, Stannp) are next — CONTRIBUTING.md has the adapter guide if you want one sooner.

License

MIT.

Add this server

Host a copy with our keys and logs.

Server facts

Tools

Questions

How do I install Mailsnail?

Does Mailsnail need an API key?

What transport does Mailsnail use?

When was Mailsnail last checked?

Documentation

Mailsnail

Hosted connector and plugins

Packages

Ways to run it

Running behind an egress proxy or allowlist

Safety

Why open source

Status

License