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MailTester Ninja

MCP server · hosted · v1.0.1 · ninja.mailtester/email-verification
Online · tested 2h agoNEW · 3h agoSeen in the registry 2h ago

Verify email addresses live against their mail server and find work emails. Nothing stored.

Website ↗How to connect ↓

What it does

MailTester Ninja is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.

No capability identified yet from its description.

Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.

At a glance

Hosted (remote)YES
Local installNO
Version1.0.1
PriceNot in the registry
First seen28 Oct 2026
Last checked2h ago

How to connect

As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 2h ago (live check)

Hosted endpoint

  • https://mcp.mailtester.ninja/mcp streamable-http

Required: X-API-Key (get it from the publisher)

MCP settings (Claude Desktop, Cursor and other MCP clients)

{
  "mcpServers": {
    "mailtester-ninja": {
      "url": "https://mcp.mailtester.ninja/mcp",
      "headers": {
        "X-API-Key": "<your X-API-Key>"
      }
    }
  }
}

Replace the values in <angle brackets>.

Live check

Electra Index connected to the hosted endpoint 2h ago

ONLINE MailTester Ninja answered an MCP connection on 28 Oct 2026 and introduced itself as mailtester-ninja 1.0.1 (MCP protocol 2025-06-18).

2 tools offered to AI assistants

  • verify_email · 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 · Find the work email address of a person from their name and their company domain. Tries the usual patterns (first.last, flast, first...) one by one and returns the first address the mail server accepts. Each pattern tried counts as one veri

What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method

Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.

Facts & evidence

Each fact shows where it was seen and when.
FactValueEvidenceSourceLast confirmed
Hosted endpointhttps://mcp.mailtester.ninja/mcpDECLAREDSRC-001 Official MCP Registry2h ago
Local install (package)noDECLAREDSRC-001 Official MCP Registry2h ago
Remote access (hosted)yesDECLAREDSRC-001 Official MCP Registry2h ago
Websitehttps://mailtester.ninja/integrations/mcp/DECLAREDSRC-001 Official MCP Registry2h ago
Registry statusactiveDECLAREDSRC-001 Official MCP Registry2h ago
Version1.0.1DECLAREDSRC-001 Official MCP Registry2h ago
MCP serveryesDECLAREDSRC-001 Official MCP Registry2h ago

Change history

  • NEW28 Oct 2026
    first seen in the index

Is this page accurate?

Flag it and our robot re-checks the official source. Reports never change a score.

Do you run MailTester Ninja? Know when it stops answering

For publishers · optional

Its hosted endpoint can be monitored. Monitoring Pro connects every 30 minutes like an AI assistant, emails you within the hour when it stops answering, keeps a 90-day availability history and adds your answer rate to your badge.

Monitor MailTester NinjaLaunch offer $39.99 once, for life instead of $9.99/month · All plans

Monitoring never changes a score or a rank.

Are you the publisher of MailTester Ninja?

Free · show your listing

An independent listing builds trust with your buyers. Announce it, and add the badge to your website or README.

Announce it on LinkedInListed on Electra Index
<a href="https://electraindex.com/mcp/mailtester-ninja?utm_source=badge&utm_medium=share&utm_campaign=listing"><img src="https://electraindex.com/api/badge/mailtester-ninja" alt="Listed on Electra Index"></a>

Questions about MailTester Ninja

How do I connect MailTester Ninja?

Use the hosted endpoint https://mcp.mailtester.ninja/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.

Does MailTester Ninja need an API key or token?

Yes. The registry entry lists a required value: X-API-Key. Get it from the publisher.

What tools does MailTester Ninja offer?

When Electra Index connected on 28 Oct 2026, it listed 2 tools: verify_email, find_email. The full list is in "Live check" above.

Is MailTester Ninja online?

Yes. Its hosted endpoint answered an MCP connection from Electra Index 2h ago.