MailSink MCP

Provides programmatic temporary email inboxes for AI agents and test automation. It offers eight typed tools for provisioning disposable addresses, waiting on signup emails, extracting OTP codes and magic links, and cleaning up after itself. It works in Claude Code, Claude Desktop, Cursor, Windsurf, and any other MCP-aware client without requiring webhook plumbing, IMAP credentials, or MIME parsing.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by heocoi

You need:Sign in at https://mailsink.dev/app with GitHubCopy the key from the one-time reveal

Vendor documentation

What you can do with it

Provision a throwaway email address for signups
Wait for and extract OTP codes from verification emails
Extract magic links from incoming emails
List and delete inboxes for cleanup

Source and maintenance

Community listingRegistry 0.1.5

mcp-registry: io.github.heocoi/mailsink@0.1.5 Source repository

Maintenance checked: Oct 31, 2026, 10:59 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@mailsink/mcp 0.1.5

npm

@mailsink/mcp package definition

{
  "version": "0.1.5",
  "transport": "stdio",
  "identifier": "@mailsink/mcp",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "MAILSINK_API_KEY",
      "format": "string",
      "isRequired": true,
      "description": "Your MailSink API key. Get it at https://mailsink.dev/auth/github"
    },
    {
      "name": "MAILSINK_API_URL",
      "format": "string",
      "description": "Optional API base URL override (defaults to https://api.mailsink.dev)"
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "mailsink-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mailsink/mcp@0.1.5"
      ],
      "env": {
        "MAILSINK_API_KEY": "<YOUR_MAILSINK_API_KEY>",
        "MAILSINK_API_URL": "<YOUR_MAILSINK_API_URL>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "mailsink-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mailsink/mcp@0.1.5"
      ],
      "env": {
        "MAILSINK_API_KEY": "<YOUR_MAILSINK_API_KEY>",
        "MAILSINK_API_URL": "<YOUR_MAILSINK_API_URL>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "mailsink-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@mailsink/mcp@0.1.5"
      ],
      "env": {
        "MAILSINK_API_KEY": "<YOUR_MAILSINK_API_KEY>",
        "MAILSINK_API_URL": "<YOUR_MAILSINK_API_URL>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "mailsink-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@mailsink/mcp@0.1.5"
      ],
      "env": {
        "MAILSINK_API_KEY": "<YOUR_MAILSINK_API_KEY>",
        "MAILSINK_API_URL": "<YOUR_MAILSINK_API_URL>"
      }
    }
  }
}

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