MailTester Ninja
Real-time email verification that stores nothing
Posted Monday, November 2, 2026
MailTester Ninja tells you whether an email address can receive mail, before you send anything to it. Each address goes through syntax, domain and MX checks, then a live SMTP conversation with the recipient's mail server that stops before any message is sent. You get a clear verdict for every address: valid, invalid, disposable, or catch-all when a domain accepts everything and cannot be confirmed. Checks run in real time, so the answer reflects the mailbox as it is today, and MailTester Ninja keeps no copy of the addresses you verify. What you can do with it: - Check one address or paste a whole list in the browser, then export the results as CSV. - Find a person's work address from a first name, a last name and a company domain. - Call the REST API from your own code, with official JavaScript and Python SDKs and an OpenAPI 3.1 description. - Connect it to n8n (official node), Zapier, Make, Clay, Google Sheets, Brevo or GetResponse. - Give AI agents verify_email and find_email tools through the official MCP server. It is built for sales teams and agencies preparing cold outreach, marketers cleaning lists before a campaign, and developers who validate signups as they happen. Pricing is flat, not per credit. Try it for free on the website (up to 50 checks a day, no signup) or with a free API token (50 checks a day). Paid plans start at $6.99 a week for 100,000 verifications a day; the Ultimate plan covers 200,000 a day for $39.99 a month, and more volume is available by choosing a quantity at checkout. No contract, cancel anytime. MailTester Ninja is run by Unlimited & Limited, an independent company based in London.