MailTester Ninja
by mailtester.ninja · ninja.mailtester/email-verification
Verify email addresses live against their mail server and find work emails. Nothing stored.
- Category
- Messaging and email
- Connection
- Remote (HTTP)
- Tools
- 2 reported
- Status
- Online
Connect it to your AI
Claude Code
claude mcp add --transport http email-verification https://mcp.mailtester.ninja/mcpClaude, ChatGPT, Cursor and other apps
Add it as a custom connector with this URL (Streamable HTTP):
https://mcp.mailtester.ninja/mcpThis server expects extra headers, usually an API key from its maker.
Cursor, VS Code and other apps (mcp.json)
{
"mcpServers": {
"email-verification": {
"url": "https://mcp.mailtester.ninja/mcp"
}
}
}Tools it offers
2 tools, as the server itself reported during our check on Oct 31, 2026.
verify_emailCheck in real time whether an email address exists and can receive mail, by asking the recipient's mail server (no message is sent). Returns code "ok" (valid), "ko" (invalid) or "mb" (uncertain, such as a catch-all domaifind_emailFind the work email address of a person from their name and their company domain. Tries the 6 most common patterns (first.last, flast, first, firstlast, first_last, f.last) one by one and returns the first address the ma
Questions
What is the MailTester Ninja MCP server?
Verify email addresses live against their mail server and find work emails. Nothing stored. It is made by mailtester.ninja and listed in the official MCP Registry as ninja.mailtester/email-verification. MCP (Model Context Protocol) is the open standard that lets AI apps like Claude, ChatGPT and Cursor use outside tools.
How do I add MailTester Ninja to Claude?
In the Claude app or claude.ai, open Settings, then Connectors, choose "Add custom connector" and paste https://mcp.mailtester.ninja/mcp. In Claude Code, run: claude mcp add --transport http email-verification https://mcp.mailtester.ninja/mcp
How do I add MailTester Ninja to ChatGPT?
ChatGPT can use remote MCP servers as connectors. In ChatGPT settings, under Apps and Connectors, turn on developer mode if asked, create a new connector and paste https://mcp.mailtester.ninja/mcp.
How do I add MailTester Ninja to Cursor?
Open Cursor settings, go to MCP, choose "Add new MCP server" (or edit ~/.cursor/mcp.json) and add: { "mcpServers": { "email-verification": { "url": "https://mcp.mailtester.ninja/mcp" } } }
Does MailTester Ninja work right now?
Yes. It responded when we last checked on 31 Oct 2026. We check remote MCP servers every day.
What can MailTester Ninja do?
It gives your AI 2 tools, including verify_email, find_email. The full list is on this page.
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Markdown (GitHub README)
[](https://chen.media/mcp/ninja-mailtester-email-verification)HTML (switches to dark mode on its own)
<a href="https://chen.media/mcp/ninja-mailtester-email-verification"><picture><source media="(prefers-color-scheme: dark)" srcset="https://chen.media/mcp/badge/ninja-mailtester-email-verification.svg?theme=dark"><img src="https://chen.media/mcp/badge/ninja-mailtester-email-verification.svg" alt="Listed on chen.media/mcp" height="40"></picture></a>More in Messaging and email
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