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io.github.iancollins27/mailsnail

السجل الرسمي المالية والمدفوعات

Send USPS letters, postcards & certified mail from any agent. No signup; pay-per-piece via Stripe.

الشيفرة المصدرية الموقع التوثيق

التثبيت

أضف هذا إلى إعدادات MCP في عميلك (Claude Desktop: claude_desktop_config.json، وCursor: ‏.cursor/mcp.json، ويستخدم VS Code وغيره الصيغة نفسها «mcpServers»).

NPM package mailsnail
Claude Code 
claude mcp add mailsnail -e 'MAIL_PROVIDER=managed' -e 'MAIL_API_BASE_URL=https://api.mailsnail.dev' -e 'CLICK2MAIL_USERNAME=<CLICK2MAIL_USERNAME>' -e 'CLICK2MAIL_PASSWORD=<your click2mail_password>' -e 'LOB_API_KEY=<your lob_api_key>' -e 'MAIL_MCP_ALLOW_LIVE=0' -e 'MAIL_MCP_SPEND_CAP_USD=25' -- npx -y mailsnail@0.6.0
إعداد JSON (Claude Desktop وCursor وVS Code) 
{
    "mcpServers": {
        "mailsnail": {
            "command": "npx",
            "args": [
                "-y",
                "mailsnail@0.6.0"
            ],
            "env": {
                "MAIL_PROVIDER": "managed",
                "MAIL_API_BASE_URL": "https://api.mailsnail.dev",
                "CLICK2MAIL_USERNAME": "<CLICK2MAIL_USERNAME>",
                "CLICK2MAIL_PASSWORD": "<your click2mail_password>",
                "LOB_API_KEY": "<your lob_api_key>",
                "MAIL_MCP_ALLOW_LIVE": "0",
                "MAIL_MCP_SPEND_CAP_USD": "25"
            }
        }
    }
}

متغيرات البيئة

  • MAIL_PROVIDER إلزامي Where to mail from: 'managed' (default, no signup, pay-per-piece via Stripe), 'click2mail' (BYO account), or 'lob' (BYO key).
  • MAIL_API_BASE_URL Hosted Mailsnail backend. Required when MAIL_PROVIDER=managed.
  • CLICK2MAIL_USERNAME Click2Mail account username. Required when MAIL_PROVIDER=click2mail.
  • CLICK2MAIL_PASSWORD سري Click2Mail account password. Required when MAIL_PROVIDER=click2mail.
  • LOB_API_KEY سري 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.

التوثيق

مأخوذ من ملف README للمشروع على GitHub ويُحدَّث أسبوعيًا. تفتح الروابط على GitHub.

المحتويات
  1. Mailsnail
  2. Hosted connector and plugins
  3. Packages
  4. Ways to run it
  5. Running behind an egress proxy or allowlist
  6. Safety
  7. Why open source
  8. Status
  9. License

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

PackageWhat it is
mailsnailMCP 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/coreProvider-agnostic core: adapters (Click2Mail, Lob, any Mailsnail gateway), multi-provider failover router, request validation. Zero dependencies.
@mailsnail/gatewaySelf-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

ModeCredentialsPayingGood for
hosted connector (api.mailsnail.dev/mcp)none; you sign inyou, per letter by card or from a balancepeople in Claude, ChatGPT, Cursor; zero-setup
managed (stdio default)noneagent, per piece (Stripe SPT)agents that can mint an SPT
gatewayyour own, on your serveryour provider accountteams; PII stays in your infra
click2mail / lob (BYOK)yours, local envyour provider accountdirect control, one provider
failover chainyours, per provideryour provider accountsmail 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:

ModeHost to permitPort
managed (default)api.mailsnail.dev443 (TCP / HTTPS CONNECT)
self-hosted gatewaywhatever MAIL_API_BASE_URL points atits port
click2mail (BYOK)rest.click2mail.com443
lob (BYOK)api.lob.com443

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.

الأسئلة الشائعة

ما هو io.github.iancollins27/mailsnail؟

Send USPS letters, postcards & certified mail from any agent. No signup; pay-per-piece via Stripe.

كيف أثبّت io.github.iancollins27/mailsnail؟

يعمل على جهازك. في Claude Code: claude mcp add mailsnail -e 'MAIL_PROVIDER=managed' -e 'MAIL_API_BASE_URL=https://api.mailsnail.dev' -e 'CLICK2MAIL_USERNAME=<CLICK2MAIL_USERNAME>' -e 'CLICK2MAIL_PASSWORD=<your click2mail_password>' -e 'LOB_API_KEY=<your lob_api_key>' -e 'MAIL_MCP_ALLOW_LIVE=0' -e 'MAIL_MCP_SPEND_CAP_USD=25' -- npx -y mailsnail@0.6.0. وفي العملاء الآخرين، الصق إعداد JSON من هذه الصفحة في إعدادات MCP الخاصة بهم.

هل يحتاج io.github.iancollins27/mailsnail إلى مفتاح API؟

نعم. يتطلب MAIL_PROVIDER, CLICK2MAIL_PASSWORD, LOB_API_KEY، وتضبطها في إعداداته.

هل io.github.iancollins27/mailsnail مفتوح المصدر؟

نعم. شيفرته متاحة على GitHub بترخيص MIT.

من يصون io.github.iancollins27/mailsnail؟

ينشره iancollins27. يدرجه AI.tn لكنه لا يصونه ولا يوصي به.

من سجل MCP الرسمي. الإدراج ليس توصية: راجع شيفرة الخادم وصلاحياته قبل منحه الوصول إلى بياناتك.