# Emaillistchecker.io Email Verification

Checks whether an address can receive mail before your agent sends anything: MX, SMTP, catch-all, disposable domains. Useful for signup forms and list cleanup.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: Emaillistchecker-io
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/Emaillistchecker-io/emaillistchecker-mcp
- Updated: 2026-10-08
- HTML: https://affpapa.org/en/nevibecode/mcp/emaillistcheckerio-email-verification

## What it does

The server runs on the vendor's side, so there is nothing to install locally — you only point your client at `https://platform.emaillistchecker.io/mcp` over Streamable HTTP with JSON responses. No account is required to start: call the `get_api_key` tool from inside the agent and you get a key. It is displayed once, stays valid for 30 days, and after that you register again.

\`verify_email` handles a single address and returns one of four verdicts: `valid`, `invalid`, `risky` or `unknown`. A `risky` result covers catch-all domains, role and disposable mailboxes, plus Microsoft 365 addresses the receiving server could not confirm. For lists there is `verify_batch`, which takes up to 25 addresses per call and gives a verdict for each. `explain_result` turns a verdict into a plain-language explanation with a send recommendation, while `estimate_cost` and `get_credit_balance` let you check credits first.

A free agent key allows 25 verifications per day, and unused ones do not carry over. Rate limits apply: 10 requests per minute per key, with only one request in flight at a time. Once the shared daily pool for free keys runs out, the server returns HTTP 429 until 00:00 UTC. Inbox placement, blacklist monitoring and the email finder need a full account.

## Requirements
- Remote server: `https://platform.emaillistchecker.io/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http email-verification https://platform.emaillistchecker.io/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add emaillistcheckerio-email-verification --url https://platform.emaillistchecker.io/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "emaillistcheckerio-email-verification": {
            "url": "https://platform.emaillistchecker.io/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "emaillistcheckerio-email-verification": {
            "type": "http",
            "url": "https://platform.emaillistchecker.io/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http emaillistcheckerio-email-verification https://platform.emaillistchecker.io/mcp
```

## When to use it
- drop dead addresses before a send goes out
- check a batch of signup emails at once
- spot a disposable mailbox among real ones
- get a plain explanation for a borderline verdict
- read the credit balance before a bulk run

## Example prompts
- Verify `user@example.com` and tell me if it is safe to send
- Run these 20 signup addresses through `verify_batch`
- Explain why this address came back as `risky`

## Similar
- [REA](https://affpapa.org/en/nevibecode/mcp/rea.md) — MCP server · ★ 392262
- [GitHub](https://affpapa.org/en/nevibecode/mcp/github.md) — MCP server · ★ 33989
- [Netdata](https://affpapa.org/en/nevibecode/mcp/netdata.md) — MCP server · ★ 81163
- [browser-use](https://affpapa.org/en/nevibecode/mcp/browser-use.md) — MCP server · ★ 119231
- [Codebase Memory](https://affpapa.org/en/nevibecode/mcp/codebase-memory.md) — MCP server · ★ 47577
- [mcp-server](https://affpapa.org/en/nevibecode/mcp/mcp-server.md) — MCP server · ★ 43902

---
NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md