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8 clients · secrets stay placeholders

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{
  "mcpServers": {
    "mailsnail": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "MAIL_PROVIDER": "managed",
        "MAIL_API_BASE_URL": "https://api.mailsnail.dev",
        "CLICK2MAIL_PASSWORD": "${CLICK2MAIL_PASSWORD}",
        "LOB_API_KEY": "${LOB_API_KEY}",
        "MAIL_MCP_ALLOW_LIVE": "0",
        "MAIL_MCP_SPEND_CAP_USD": "25"
      }
    }
  }
}

claude mcp add mailsnail -e "MAIL_PROVIDER=managed" -e "MAIL_API_BASE_URL=https://api.mailsnail.dev" -e "CLICK2MAIL_PASSWORD=${CLICK2MAIL_PASSWORD}" -e "LOB_API_KEY=${LOB_API_KEY}" -e "MAIL_MCP_ALLOW_LIVE=0" -e "MAIL_MCP_SPEND_CAP_USD=25" -- npx -y [email protected]

[mcp_servers.mailsnail]
command = "npx"
args = ["-y", "[email protected]"]
env = { "MAIL_PROVIDER" = "managed", "MAIL_API_BASE_URL" = "https://api.mailsnail.dev", "CLICK2MAIL_PASSWORD" = "${CLICK2MAIL_PASSWORD}", "LOB_API_KEY" = "${LOB_API_KEY}", "MAIL_MCP_ALLOW_LIVE" = "0", "MAIL_MCP_SPEND_CAP_USD" = "25" }

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "mailsnail": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "[email protected]"
      ],
      "enabled": true,
      "environment": {
        "MAIL_PROVIDER": "managed",
        "MAIL_API_BASE_URL": "https://api.mailsnail.dev",
        "CLICK2MAIL_PASSWORD": "{env:CLICK2MAIL_PASSWORD}",
        "LOB_API_KEY": "{env:LOB_API_KEY}",
        "MAIL_MCP_ALLOW_LIVE": "0",
        "MAIL_MCP_SPEND_CAP_USD": "25"
      }
    }
  }
}

{
  "mcpServers": {
    "mailsnail": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "MAIL_PROVIDER": "managed",
        "MAIL_API_BASE_URL": "https://api.mailsnail.dev",
        "CLICK2MAIL_PASSWORD": "${CLICK2MAIL_PASSWORD}",
        "LOB_API_KEY": "${LOB_API_KEY}",
        "MAIL_MCP_ALLOW_LIVE": "0",
        "MAIL_MCP_SPEND_CAP_USD": "25"
      }
    }
  },
  "deeplink": "cursor://anysphere.cursor-deeplink/mcp/install?name=mailsnail&config=eyJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIm1haWxzbmFpbEAwLjYuMCJdLCJlbnYiOnsiTUFJTF9QUk9WSURFUiI6Im1hbmFnZWQiLCJNQUlMX0FQSV9CQVNFX1VSTCI6Imh0dHBzOi8vYXBpLm1haWxzbmFpbC5kZXYiLCJDTElDSzJNQUlMX1BBU1NXT1JEIjoiJHtDTElDSzJNQUlMX1BBU1NXT1JEfSIsIkxPQl9BUElfS0VZIjoiJHtMT0JfQVBJX0tFWX0iLCJNQUlMX01DUF9BTExPV19MSVZFIjoiMCIsIk1BSUxfTUNQX1NQRU5EX0NBUF9VU0QiOiIyNSJ9fQ%3D%3D"
}

{
  "servers": {
    "mailsnail": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "MAIL_PROVIDER": "managed",
        "MAIL_API_BASE_URL": "https://api.mailsnail.dev",
        "CLICK2MAIL_PASSWORD": "${CLICK2MAIL_PASSWORD}",
        "LOB_API_KEY": "${LOB_API_KEY}",
        "MAIL_MCP_ALLOW_LIVE": "0",
        "MAIL_MCP_SPEND_CAP_USD": "25"
      }
    }
  }
}

{
  "mcpServers": {
    "mailsnail": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "MAIL_PROVIDER": "managed",
        "MAIL_API_BASE_URL": "https://api.mailsnail.dev",
        "CLICK2MAIL_PASSWORD": "${CLICK2MAIL_PASSWORD}",
        "LOB_API_KEY": "${LOB_API_KEY}",
        "MAIL_MCP_ALLOW_LIVE": "0",
        "MAIL_MCP_SPEND_CAP_USD": "25"
      }
    }
  }
}

extensions:
  "mailsnail":
    enabled: true
    name: "mailsnail"
    type: stdio
    cmd: "npx"
    args:
      - "-y"
      - "[email protected]"
    envs:
      "MAIL_PROVIDER": "managed"
      "MAIL_API_BASE_URL": "https://api.mailsnail.dev"
      "CLICK2MAIL_PASSWORD": "${CLICK2MAIL_PASSWORD}"
      "LOB_API_KEY": "${LOB_API_KEY}"
      "MAIL_MCP_ALLOW_LIVE": "0"
      "MAIL_MCP_SPEND_CAP_USD": "25"
    timeout: 300

Placeholders to fill from your own secret store: ${CLICK2MAIL_PASSWORD}, ${LOB_API_KEY}. The registry never accepts secret values.

This is a local package: the command runs on your machine.

Quality – / 100not scored

Not scored: fewer than three checks apply, usually because no remote answered a credential-free probe or the server is a local package.

protocoln/a · weight 25

n/a
protocol.modern, protocol.stateless, protocol.transport, protocol.list_ttlno remote answered a protocol handshake (not probed yet, unreachable, or local-only)

authorizationn/a · weight 15

n/a
auth.prm, auth.as_metadata, auth.cimdno remote uses OAuth
n/a
auth.secret_in_urlno templated URL

tool hygienen/a · weight 30

n/a
tools.descriptions, tools.description_length, tools.schemas, tools.annotations, tools.directory_hints, tools.token_cost, tools.api_dumptool list unknown (behind auth, not probed, or empty)

stabilityn/a · weight 15

n/a
stability.changes, stability.rug_pulltool list unknown

dependencies67 · weight 15

pass
deps.known_vulnsno known advisory in 99 resolved packages
fail
deps.mcp_sdk_version@modelcontextprotocol/sdk 1.30.1 has 1 known advisory (GHSA-6qxp-vccf-f47h); update @modelcontextprotocol/sdk to 1.31.0 or later
pass
deps.resolvable[email protected] resolved: 99 packages

Tool list unknown · checked 2026-10-19 16:20 UTC

Tool changes

No tool definition changes recorded. A server's first observation is its baseline; later probes record what changes.

Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed. How it is computed.

Trust 86 / 100

provenance90

livenessn/a

freshness65

hygiene100

+repository +namespace-matches-repo +website ~liveness-unmeasured ~updated-96d-ago

Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed. How it is computed.

Dependencies

[email protected] npm98 dependencies, resolved · MCP SDK @modelcontextprotocol/sdk 1.30.1 · advisories checked 2026-10-19

advisory	severity	package	fixed in
GHSA-6qxp-vccf-f47hMCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP server	high	`@modelcontextprotocol/[email protected]`MCP SDK, direct	fixed in `1.31.0`

Dependency graphs from deps.dev; advisories from OSV.dev, including the GitHub Advisory Database and the PyPI Advisory Database; all CC BY 4.0. The graph is what a clean install of this version resolves today; nothing was installed or run. How it is checked.

Endpoints

package	registry	version	runtime	secrets
`mailsnail`	npm	0.6.0	–	`CLICK2MAIL_PASSWORD`, `LOB_API_KEY`

Tools (0)

No tools observed. Local packages are never executed by the registry.

Schemas: list_tools.

Similar MCP servers

Official server.json

{
  "name": "io.github.iancollins27/mailsnail",
  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-09-29/server.schema.json",
  "version": "0.6.0",
  "packages": [
    {
      "version": "0.6.0",
      "transport": {
        "type": "stdio"
      },
      "identifier": "mailsnail",
      "registryType": "npm",
      "registryBaseUrl": "https://registry.npmjs.org",
      "environmentVariables": [
        {
          "name": "MAIL_PROVIDER",
          "default": "managed",
          "isRequired": true,
          "description": "Where to mail from: 'managed' (default, no signup, pay-per-piece via Stripe), 'click2mail' (BYO account), or 'lob' (BYO key)."
        },
        {
          "name": "MAIL_API_BASE_URL",
          "default": "https://api.mailsnail.dev",
          "description": "Hosted Mailsnail backend. Required when MAIL_PROVIDER=managed."
        },
        {
          "name": "CLICK2MAIL_USERNAME",
          "description": "Click2Mail account username. Required when MAIL_PROVIDER=click2mail."
        },
        {
          "name": "CLICK2MAIL_PASSWORD",
          "isSecret": true,
          "description": "Click2Mail account password. Required when MAIL_PROVIDER=click2mail."
        },
        {
          "name": "LOB_API_KEY",
          "isSecret": true,
          "description": "Lob API key. Required when MAIL_PROVIDER=lob. test_* is free; live_* actually mails."
        },
        {
          "name": "MAIL_MCP_ALLOW_LIVE",
          "default": "0",
          "description": "Set to '1' to actually mail in BYOK modes. Default '0' is dry-run."
        },
        {
          "name": "MAIL_MCP_SPEND_CAP_USD",
          "default": "25",
          "description": "Per-session estimated spend cap. Server refuses sends past this."
        }
      ]
    }
  ],
  "repository": {
    "url": "https://github.com/iancollins27/mailsnail",
    "source": "github"
  },
  "websiteUrl": "https://mailsnail.dev",
  "description": "Send USPS letters, postcards & certified mail from any agent. No signup; pay-per-piece via Stripe."
}