--- title: "MailTester Ninja MCP server" url: "https://martechdb.com/vendors/mailtester-ninja" markdown_url: "https://martechdb.com/vendors/mailtester-ninja.md" api_url: "https://martechdb.com/api/v1/vendors/mailtester.ninja" updated: "2026-10-29" --- # MailTester Ninja MCP server Yes. MailTester Ninja publishes an official MCP server at https://mcp.mailtester.ninja/mcp. It's hosted. It offers 2 tools. We last checked it on 1 Nov 2026. MartechDB lists only servers the vendor publishes itself, never community servers. **Key facts:** As of 1 Nov 2026, MailTester Ninja's official MCP server scores 65/100 (provisional) on MartechDB's Agent Readiness Index (v1.1). It lists 2 tools. - Website: [mailtester.ninja](https://mailtester.ninja) - Categories: [Email delivery & deliverability](https://martechdb.com/categories/email-delivery-deliverability.md) ## Review MailTester Ninja's MailTester Ninja MCP scores 65/100 on MartechDB's Agent Readiness Index: easy to connect an AI agent to, with a few gaps. The good: - Hosted by MailTester Ninja: connect by URL, with nothing to install - Documented, with 2 tools known Not checked yet: how you sign in; what agent access costs. ## Agent Readiness Index: 65/100 (provisional) How friendly MailTester Ninja is to AI agents, from its best official MCP server. Anything not yet researched scores nothing, so this score may rise once it is. Methodology v1.1: https://martechdb.com/methodology. - Official MCP server: 30/30 (Published by the vendor) - Hosted by the vendor: 25/25 (Connect by URL, nothing to install) - OAuth sign-in: pending (Sign-in: see vendor docs) - Documented tools: 10/10 (A docs page, and its tools are known) - Free to start, pay as you go: pending (Not checked yet) ## MailTester Ninja MCP - Address: https://mcp.mailtester.ninja/mcp - Runs: Hosted - Sign-in: Sign-in: see vendor docs (`unknown`) - Official MCP Registry: not listed - Documentation: https://mailtester.ninja/integrations/mcp/ - How we know it's official: Documented on MailTester Ninja's own site, at mailtester.ninja - First seen: 2026-10-29 - Last checked: 2026-11-01 - Recent checks: 3 of the last 3 reachable ### Tools (2) As the server lists them on 2026-11-01. Names and descriptions come from the vendor's server. - `verify_email` (read-only): Check 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 domain) with a message. - `find_email` (read-only): Find 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 mail server accepts. Stops early when the domain accepts every address (catch-all) and then gives the most common pattern as "guess". Each pattern tried counts as one verification. Personal email providers such as gmail.com are not searched. Requires a paid MailTester Ninja key. ### Connect it Claude Code: ```sh claude mcp add --transport http mailtester-ninja https://mcp.mailtester.ninja/mcp ``` - Add to Cursor: - Add to VS Code: - Claude.ai and Claude Desktop: Customize, Connectors, "+", Add custom connector, then paste https://mcp.mailtester.ninja/mcp - ChatGPT: Settings, Apps, Advanced settings, turn on Developer mode, Create, then paste https://mcp.mailtester.ninja/mcp (this usually works only with servers that use self-serve sign-in or none) JSON for Cursor, Windsurf and other clients that connect to hosted servers: ```json { "mcpServers": { "mailtester-ninja": { "type": "http", "url": "https://mcp.mailtester.ninja/mcp" } } } ``` ## Questions ### Does MailTester Ninja have an official MCP server? Yes. MailTester Ninja publishes its MCP server itself. MailTester Ninja's own documentation describes it. MartechDB only lists servers a vendor publishes, never community copies. ### What is the MailTester Ninja MCP server URL? The address is https://mcp.mailtester.ninja/mcp. ### How do I connect MailTester Ninja MCP to Claude, ChatGPT or Cursor? In Claude, add https://mcp.mailtester.ninja/mcp as a custom connector (Customize, Connectors, Add custom connector). In Cursor, use the Add to Cursor link on MartechDB's page, or paste the JSON settings into your mcp.json. In Claude Code, run: claude mcp add --transport http mailtester-ninja https://mcp.mailtester.ninja/mcp ### What can the MailTester Ninja MCP server do? It offers 2 tools: verify\_email and find\_email (as listed on 1 Nov 2026). All of them are marked read-only. ### Is the MailTester Ninja MCP server in the official MCP Registry? No. MailTester Ninja hasn't published it to the official MCP Registry. ### Is the MailTester Ninja MCP server working? Yes. It answered our most recent check. We last checked it on 1 Nov 2026. ### What are the alternatives to MailTester Ninja's MCP server? In Email delivery & deliverability, the most agent-friendly alternatives with an official MCP server are G-Lock Software (92/100), Usebouncer (91/100), Bird (89/100), Unspam.email (88/100) and Resend (85/100). MailTester Ninja scores 65/100 on the same index. ## Change history - 2026-10-29: Added to MartechDB with MailTester Ninja MCP ## Alternatives to MailTester Ninja's MCP server In Email delivery & deliverability, the most agent-friendly first: - [G-Lock Software](https://martechdb.com/vendors/g-lock-software.md) (glockapps.com), Agent Readiness Index 92/100 - [Usebouncer](https://martechdb.com/vendors/usebouncer.md) (usebouncer.com), Agent Readiness Index 91/100 - [Bird](https://martechdb.com/vendors/bird.md) (bird.com), Agent Readiness Index 89/100 - [Unspam.email](https://martechdb.com/vendors/unspamemail.md) (unspam.email), Agent Readiness Index 88/100 - [Resend](https://martechdb.com/vendors/resend.md) (resend.com), Agent Readiness Index 85/100 ## Get this data - API: `curl https://martechdb.com/api/v1/vendors/mailtester.ninja` - MCP: `claude mcp add --transport http martechdb https://martechdb.com/mcp`, then ask about MailTester Ninja. - Web page: https://martechdb.com/vendors/mailtester-ninja