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Mail Tester Ninja

Tests email addresses in real time for syntax and deliverability, and finds addresses from name and domain inputs, via web or API.

Actively maintained

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mailtester.ninja ↗Wikidata
Open mailtester.ninjaAlternativesSet it up for my team
Mail Tester Ninja: data, price, alternatives
  • Is it safe? What Mail Tester Ninja says it does with your chats and data, from its own policy pages.See ↓
  • Is it free? We have not read the prices of Mail Tester Ninja yet; they are next in our queue. Until then, the official site has them.mailtester.ninja ↗
  • What else does this? We have not measured alternatives for this one yet. If you know one, add it below.See ↓
At a glancechecked Oct 28, 2026

not read yet

Use

For
Email marketers and sales teams cleaning mailing lists and finding prospect addresses for outreach
Activity
Actively maintainedsite updated 7 days ago
Company
since 2018per Wikidata
How it runs
API
Used for
  • confirm a single address is deliverable before sending
  • remove invalid addresses from a mailing list before a campaign
  • locate missing addresses for outreach contacts
Worth knowingcomputed from what we read · each with its source
The companyeach fact with its source · read Oct 29, 2026
  • Founded2018per Wikidata
  • HeadquartersLondonper Wikidata
Your datawhat they publish, each line with its page · read Oct 29, 2026

These are Mail Tester Ninja's own statements, read from its pages. We did not audit them. A line that is missing was not found on the pages we read; it does not mean the practice is absent.

How a program reaches itfound, not claimed · read Oct 29, 2026
  • MCP serverninja.mailtester/email-verificationverified in the MCP registry
  • Stateanswers, 2 toolschecked 2026-10-29
  • Address to connectmcp.mailtester.ninja/mcp
  • OpenAPI spec1 pathsthe spec ↗

MCP server details →

This card as JSON, for your agent →

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.

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beta

Three tools from the Atlas for the job you describe, each with what fits and what does not.

From people who use itnot part of the reading

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Questions this page answers
  • What is Mail Tester Ninja?

    Tests email addresses in real time for syntax and deliverability, and finds addresses from name and domain inputs, via web or API.

  • Who is Mail Tester Ninja for?

    Email marketers and sales teams cleaning mailing lists and finding prospect addresses for outreach

  • Is Mail Tester Ninja still maintained?

    Actively maintained: site updated 7 days ago.

  • Is Mail Tester Ninja safe?

    We do not audit vendors. What Mail Tester Ninja publishes, read 2026-10-29: GDPR stated on its privacy policy.

How we read a tool

No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.

  • Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
  • Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
  • Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
  • The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.

How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.

How we read every tool → · By INITE Atlas Desk