Real-time email verification and email finding that never stores your data
Estimated monthly website visits
Similarweb estimates for this domain, not active users. Only available observation months are shown; collection date is separate from the traffic period.
Collected Nov 11, 2026
This is our editors' assessment out of 5, not an average of user ratings. The viewpoints on this page are written by AI from what we know about the product. They are not customer reviews.
According to OpenAITools.app telemetry verified on 2026-11-11, MailTester.Ninja (rork.com) is an AI platform indexed under AI Email Marketing generating 452.79K monthly visits with a month-over-month traffic delta of -50.21K (-10%). Its primary geographic market is United States (34.1% traffic share), and it operates on a Freemium pricing model. Top competing alternatives by monthly volume include BillionVerify (EmailVerify AI) (0 visits/mo), SendBridge (23.12K visits/mo), MailTester.AI (5.4K visits/mo).
Cleaned my outbound lead list with zero bounce back issues.
Some obscure mail servers return unknown instead of valid.
Fast and privacy focused email verification tool.
Great Zapier integration for automated list cleaning.
AI-synthesized perspectives grounded in live site inspection, pricing structure, and category benchmarks — presented as editorial viewpoints rather than individual customer testimonials.
Runs syntax, DNS, MX and mailbox-level checks on a single address, returning an accepted, rejected or uncertain verdict without ever delivering an email.
Enter a name and company domain to surface the most likely business address patterns, with each candidate labelled found or rejected.
Use the REST API, or connect through Zapier, Make, n8n, Google Sheets, WordPress, a Chrome extension and MCP to verify at scale or inside existing workflows.
Verified addresses are not kept on the service's servers, which supports GDPR-friendly list hygiene practices.
Companion tools score a sending domain, test a message, and check whether an IP or domain appears on major blocklists.
MailTester.Ninja focuses on one job: telling you whether an email address will actually accept mail before you send. Each query runs through a classic verification chain — syntax parsing, DNS lookup, MX discovery, an SMTP handshake and a RCPT TO probe — so you see whether the mailbox accepted, rejected or returned an uncertain verdict. Because the service never sends a message to the address, it can be used safely against prospects and existing subscribers alike.
Alongside the verifier sits an email finder that takes a company domain and suggests the most probable address patterns for a named contact, marking each candidate as found or rejected. Together the two tools cover list hygiene and list building in one place. The vendor highlights that verified addresses are not retained on its servers, positioning the product for GDPR-conscious teams.
For production use, MailTester.Ninja exposes a REST endpoint plus connectors for automation platforms and spreadsheets, so verification can be embedded in signup forms, CRM pipelines or bulk list-cleaning jobs. A built-in report view summarises the mix of valid, invalid and uncertain results across recent activity, and extra deliverability utilities such as domain audits, sender scoring and blocklist checks help diagnose why mail lands in spam.
Bulk-verify subscribers to strip invalid and risky addresses so bounce rates stay low and sender reputation is protected.
Pair a contact name with a company domain to generate likely addresses, then verify the best candidate before outreach.
Call the REST API or connect via Zapier, Make or n8n so new signups are checked the moment they are captured.
Side-by-side telemetry comparison of competing AI tools in the same primary category
| Rank | AI Tool | Monthly Visits | MoM Growth | Direct traffic share | Pricing | Head-to-Head |
|---|---|---|---|---|---|---|
| ● | MailTester.Ninja | 452.79K | -10% | 58% direct | Freemium | Current |
| 1 | BillionVerify (EmailVerify AI) Performs deep real-time SMTP mailbox verification and bulk list cleaning like MailTester.Ninja, but with bulk API support. | 0 | 0% | — | Freemium, Paid | vs BillionVerify (EmailVerify AI) |
| 2 | SendBridge Checks address deliverability and cleans email lists in real time, offering similar validation workflows. | 23.12K | -15.1% | 41% direct | Freemium, Paid | vs SendBridge |
| 3 | MailTester.AI Focuses on email deliverability and inbox placement testing, though with different bulk processing limits. | 5.4K | -16.7% | 40% direct | Freemium | vs MailTester.AI |
| 4 | Emaildojo Provides free deliverability, spam score, and blocklist scans, but lacks deep individual mailbox lookup tools. | 1.27K | -26.8% | 39% direct | Free | vs Emaildojo |
| 5 | Unspam AI Offers comprehensive spam testing and inbox placement scores, but less focused on raw syntax verification. | 79.14K | -13.7% | 47% direct | Freemium | vs Unspam AI |
| 6 | Kasplo Email Intelligence Audits email authentication and campaign placement, but is tailored more for marketing than single checks. | 3.53K | -28.1% | 39% direct | Contact for Pricing | vs Kasplo Email Intelligence |
Performs deep real-time SMTP mailbox verification and bulk list cleaning like MailTester.Ninja, but with bulk API support.
Performs deep real-time SMTP mailbox verification and bulk list cleaning like MailTester.Ninja, but with bulk API support.
Checks address deliverability and cleans email lists in real time, offering similar validation workflows.
Checks address deliverability and cleans email lists in real time, offering similar validation workflows.
Focuses on email deliverability and inbox placement testing, though with different bulk processing limits.
Focuses on email deliverability and inbox placement testing, though with different bulk processing limits.
SpecialistProvides free deliverability, spam score, and blocklist scans, but lacks deep individual mailbox lookup tools.
SpecialistProvides free deliverability, spam score, and blocklist scans, but lacks deep individual mailbox lookup tools.
SpecialistOffers comprehensive spam testing and inbox placement scores, but less focused on raw syntax verification.
SpecialistOffers comprehensive spam testing and inbox placement scores, but less focused on raw syntax verification.
SpecialistAudits email authentication and campaign placement, but is tailored more for marketing than single checks.
SpecialistAudits email authentication and campaign placement, but is tailored more for marketing than single checks.
Built for cold email outreach with automated warmup and deliverability tools rather than standalone single verifications.
Built for cold email outreach with automated warmup and deliverability tools rather than standalone single verifications.
Combines cold email campaigns with lead databases and deliverability tools, replacing the need for separate verification.
Free / Open-sourceFeatures robust email warmup and outreach automation alongside deliverability checks, though less focused on raw list cleaning.
Free / Open-sourceFeatures robust email warmup and outreach automation alongside deliverability checks, though less focused on raw list cleaning.
SpecialistFinds and verifies professional email addresses from LinkedIn, but acts as a broader lead generation tool.
SpecialistFinds and verifies professional email addresses from LinkedIn, but acts as a broader lead generation tool.
Provides B2B lead generation and email verification alongside automated outreach campaigns.
Provides B2B lead generation and email verification alongside automated outreach campaigns.
Free / Open-sourceAll-in-one marketing platform with robust email deliverability tools, but lacks dedicated list verification APIs.
Free / Open-sourceAll-in-one marketing platform with robust email deliverability tools, but lacks dedicated list verification APIs.
