MailTester Ninja review
Browser, desktop and API checks pair email verification with business contact finding.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
MailTester Ninja combines email verification with a business email finder for marketers, sales teams and developers who need to clean lists or check addresses as they are submitted. Single addresses can be checked in a browser, while bulk verification accepts text and CSV uploads. A REST API supports address checks in other systems, and a standalone desktop app is available for bulk work. The product also checks SMTP, syntax and domain/MX information, and detects disposable addresses, catch-all domains and spam traps.
The free plan provides single-address checks on the website. Paid plans specify daily rather than monthly quotas: Starter costs $6.99 per week and lists 100,000 emails and 100,000 API calls daily; Pro costs $23.99 per month with the same daily limits; Ultimate costs $39.99 per month and raises both to 200,000 daily. All three plans state that no personal data is stored. The weekly Starter billing is worth weighing against the monthly options, particularly for teams comparing recurring costs.
Platform coverage spans web, Windows, macOS and API access, making it suitable for teams that want desktop bulk verification alongside browser checks or programmatic use. The feature set is broad for list hygiene and contact discovery, but the published support channel is documentation, and integrations are not listed. Teams that need direct support or established integrations should consider alternatives; small teams seeking desktop access, API checks and email finding may find the combination a closer fit.
MailTester Ninja pros and cons
- Where it wins
- Verifies single addresses and bulk lists via text or CSV upload
- Checks SMTP, syntax and domain/MX, with disposable and spam-trap detection
- Offers a REST API and an email finder for business contacts
- Where it doesn't
- Starter is billed weekly, unlike the monthly Pro and Ultimate plans
- Desktop apps are available for Windows and macOS only
- Support is documentation-only
MailTester Ninja fact sheet, pricing and score →
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