MailTester Ninja Review: Is It The Right Email Verification Tools For Your Team?

What is MailTester Ninja?

Sending to addresses that no longer exist is one of the fastest ways to land in spam: mailbox providers watch bounce rates closely and penalise senders who ignore them. MailTester Ninja gives sales, marketing and product teams a quick way to remove those addresses beforehand. What it checks Each address goes through four steps: format, domain, mail server records, and finally a live exchange with the mail server that hosts it. That last step confirms whether the mailbox currently accepts mail, and it is interrupted before anything is delivered. Throwaway inboxes are recognised without contacting any server, and domains configured to accept everything are clearly marked, so a risky address is never mistaken for a safe one. Users report bounce rates under 1% once their lists are cleaned. For lists and for code Upload a file or paste addresses in the browser and export the verdicts, or connect your own software to the REST API: one request per address, JSON back, with ready-made Python and JavaScript libraries and an OpenAPI 3.1 description. Teams that prefer automation tools can follow the published guides for Google Sheets, Clay, Zapier, Make and n8n. An email finder completes the set by working out a contact's work address from a person's name and the domain of their employer. Data protection Verified addresses are not kept after the check, which keeps the service in line with GDPR. Cost There is a free tier to start, on the website and through the API. Paid subscriptions are billed by the week or the month, not per credit: $6.99 weekly or $23.99 monthly for 100,000 checks per day, $39.99 monthly for 200,000, and more capacity when needed. No long-term commitment. The product is built and operated by Unlimited & Limited, a company registered in London.