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Disposable email inboxes for AI agents — OTPs and magic links auto-extracted. No signup needed.
About
Disposable email inboxes for AI agents — OTPs and magic links auto-extracted. No signup needed.
Security Report
Well-structured MCP server with proper authentication handling, clean code quality, and appropriate permissions for its stated purpose. The server makes network requests only to a configurable ZeroDrop endpoint, uses environment variables correctly for API key storage, and implements basic input validation via zod schemas. Minor improvements could be made to error handling specificity and request timeout configuration. Supply chain analysis found 1 known vulnerability in dependencies (0 critical, 1 high severity). Package verification found 1 issue.
3 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Environment variable: ZERODROP_API_KEY
Environment variable: ZERODROP_BASE_URL
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"dev-zerodrop-zerodrop-mcp": {
"env": {
"ZERODROP_API_KEY": "your-zerodrop-api-key-here",
"ZERODROP_BASE_URL": "your-zerodrop-base-url-here"
},
"args": [
"-y",
"zerodrop-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
zerodrop-mcp
Email verification for AI agents — an MCP server that gives Claude, Cursor, Claude Code, and any MCP client disposable email inboxes with auto-extracted OTPs and magic links.
Your agent signs up for a service. The service sends a verification code. Without an inbox it can read, the agent is stuck. With zerodrop-mcp:
Agent: generate_inbox()
→ swift-x7k29ab@zerodrop-sandbox.online
Agent: [fills the signup form with that address]
Agent: wait_for_email(inbox, require_otp: true)
→ { "otp": "847291", "subject": "Verify your email", ... }
Agent: [enters 847291 — flow complete]
No Docker. No SMTP. No API key. No signup. Free tier works out of the box.
Install
Claude Code
claude mcp add zerodrop -- npx -y zerodrop-mcp
Claude Desktop
Add to claude_desktop_config.json:
{
"mcpServers": {
"zerodrop": {
"command": "npx",
"args": ["-y", "zerodrop-mcp"]
}
}
}
Cursor
Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):
{
"mcpServers": {
"zerodrop": {
"command": "npx",
"args": ["-y", "zerodrop-mcp"]
}
}
}
Tools
generate_inbox
Creates a disposable email address. Local and instant — no network request.
| Param | Type | Description |
|---|---|---|
prefix | string, optional | Prefix for the inbox name, e.g. your app name |
Returns the inbox address and a live watch URL.
wait_for_email
Blocks until a matching email arrives, then returns it with the OTP and magic link already extracted — the agent never parses HTML or regexes a body.
| Param | Type | Description |
|---|---|---|
inbox | string | Address from generate_inbox |
timeout_seconds | number, optional | Default 30, max 120 |
from_contains | string, optional | Filter by sender |
subject_contains | string, optional | Filter by subject |
require_otp | boolean, optional | Only match emails with an OTP |
require_magic_link | boolean, optional | Only match emails with a magic link |
Returns:
{
"from": "noreply@yourapp.com",
"subject": "Your verification code",
"received_at": "2026-07-18T12:34:56Z",
"otp": "847291",
"magic_link": null,
"body_preview": "Your code is: 847291..."
}
check_inbox
Non-blocking snapshot of the inbox — recent emails with extracted fields, or an empty list.
What agents use this for
- Testing auth flows end to end — signup → OTP → verified, driven entirely by the agent
- QA automation — Claude Code writing and running Playwright tests that need real inboxes
- Autonomous workflows — any agent task that hits an email-verification wall
- Development — "sign up for my own app and tell me if the verification email works"
How it works
Emails sent to a generated inbox are caught at Cloudflare's edge by ZeroDrop's open-source worker. OTPs and magic links are extracted at the edge before your agent reads them. Inboxes auto-delete after 30 minutes on the free tier.
Configuration
Environment variables (set in your MCP client config):
| Variable | Default | Description |
|---|---|---|
ZERODROP_API_KEY | — | Workspace key. Omit for free sandbox mode. |
ZERODROP_BASE_URL | https://zerodrop.dev | Self-hosted instance URL |
{
"mcpServers": {
"zerodrop": {
"command": "npx",
"args": ["-y", "zerodrop-mcp"],
"env": { "ZERODROP_API_KEY": "your-key" }
}
}
}
Writing tests instead?
If you're generating test code rather than driving flows live, use the SDKs directly:
npm · PyPI · Go · RubyGems · Packagist · JitPack · GitHub Action
AI coding assistant context: docs.zerodrop.dev/ai-coding
Security
- The server makes requests only to
ZERODROP_BASE_URL(zerodrop.dev by default) — nothing else - Inbox generation is fully local
- Two runtime dependencies: the official MCP SDK and zod
- Report issues: founder@zerodrop.dev
License
MIT — zerodrop.dev
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