Guide: Connecting MailSandbox to Cursor and Claude Desktop
The MailSandbox MCP server is used to: MailSandbox (a fork of Mailpit) is a fast, zero-dependency email testing tool & API with a web UI, SMTP server, Postmark API emulation, and MCP server for AI-assisted debugging. Instead of manually writing configuration files, use the generator on the right.
AI Skills (Prompt Recipes)
Copy these prompts and send them to Claude/Cursor after connecting the tool to activate the skills:
Prompts for this server will be added soon.
Common Troubleshooting Issues:
- Missing commas in
claude_desktop_config.json, which crashes the entire client. - Incorrect slash escaping in Windows paths (use
\\\\instead of\\). - Incorrect arguments syntax in the JSON array.
Fill in the fields below to generate the JSON config, CLI command, or schema for AI agents.
claude_desktop_config.json
Terminal / Console
Tool JSON Schema for OpenAI/CrewAI
LangChain Python Tool