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TL;DR

MailSandbox is a Testing MCP server that lets Claude Code, Cursor, Windsurf and any MCP-compatible AI agent fast, zero-dependency email testing tool. Install in 1 minute with mcpizy install mailsandbox.

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MailSandbox

Testing

Last updated May 30, 2026 · By MCPizy team

Fast, zero-dependency email testing tool. Safe email sandbox for development.

Install MailSandbox

Via MCPizy CLI (recommended):
mcpizy install mailsandbox
Or run directly:
npx -y @mailsandbox/mcp
View on GitHub

Works with

Claude Code
Claude Desktop
Cursor
Windsurf
VS Code + Copilot
Any MCP Client

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Key Takeaways

  • MailSandbox exposes an MCP interface for testing workflows in Claude Code, Cursor and Windsurf.
  • No authentication required — works out of the box once installed.
  • Install in 1 command: mcpizy install mailsandbox — config written to your client automatically.
  • Free and open source (GitHub source linked above) — verified compatible with every MCP client (Claude Code, Claude Desktop, Cursor, Windsurf, VS Code + Copilot).
  • Best use case: automate testing workflows from your AI agent without leaving the editor.

Frequently asked questions

What is the MailSandbox MCP server?

The MailSandbox MCP server is an Testing Model Context Protocol server that lets Claude Code, Cursor, Windsurf, VS Code with Copilot, and other MCP-compatible AI agents fast, zero-dependency email testing tool. It exposes MailSandbox's capabilities as tools the AI can call directly from your editor or CLI.

How do I install MailSandbox MCP with Claude Code?

The fastest way is the MCPizy CLI: run `mcpizy install mailsandbox` and MCPizy will add the server to your `.claude.json` automatically. You can also install it manually by adding an entry under `mcpServers` in `.claude.json` with the command `npx -y @mailsandbox/mcp` and restarting Claude Code.

Is MailSandbox MCP free?

Yes. The MailSandbox MCP server is free and open source (see the GitHub repository linked on this page). You may still need a MailSandbox account or API key to connect the server to the underlying service, but the MCP layer itself has no MCPizy subscription cost.

Does MailSandbox MCP work with Cursor and Windsurf?

Yes. Any MCP-compatible client works — including Claude Code, Claude Desktop, Cursor (via `.cursor/mcp.json`), Windsurf, VS Code with Copilot Chat, and custom agents built on the MCP SDK. The same install command targets all of them; only the config file path differs.

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What can I do with MailSandbox MCP?

Once installed, your AI agent can fast, zero-dependency email testing tool directly inside your conversation. Typical use cases include asking Claude Code or Cursor to run MailSandbox operations, inspect results, chain MailSandbox with other MCP servers (see our Workflow Recipes), and automate repetitive testing tasks without leaving your editor.