What MailTester.Ninja does

MailTester.Ninja is a London-based email verification and finder SaaS platform developed and operated by Unlimited & Limited. The platform validates email addresses in real time using a seven-checkpoint SMTP-level pipeline covering syntax, domain validity, DNS, MX records, SMTP mailbox confirmation, disposable email detection, catch-all identification, and spam trap screening, processing each address in under two seconds. The same session also supports an Email Finder capability that discovers professional contact addresses by name and company domain and verifies them in the same step. A REST API is bundled into all paid plans for real-time signup form validation and CRM integration.

The company sells exclusively through a self-serve, product-led growth motion with a free tier and three flat-rate subscription tiers priced by daily verification capacity rather than per-email credits: Starter at $6.99/week for 50,000 verifications/day, Pro at $16.99/month for 100,000/day, and Ultimate at $49.99/month for 500,000/day. The central commercial differentiator is this flat-cap model, which the company claims delivers material cost savings versus per-email credit competitors (e.g., roughly $16.99/month versus $2,750/month at one million monthly verifications on ZeroBounce), alongside a zero data retention architecture that processes emails in volatile memory to enable structural GDPR compliance. Customer acquisition is driven by SEO, an in-house content blog covering email deliverability and cold outreach topics, and earned media in publications including HackerNoon, Entrepreneur, Business Enquirer, and London Loves Business.

The company is bootstrapped with no external venture funding and operates with a lean team of 1-10 people led by co-founder Alexandre Biegala (CEO) and Danila Kozlov (CMO/COO). It reports more than 100,000 users, 1,000,000+ emails processed per day, and reach across 159 countries, with named logo customers including Revolut, Gartner, Sotheby's, EY, Instantly.ai, Prove, Taapit, and Osapiens. Revenue is distributed across a long tail of SMB and individual users rather than concentrated in a small number of enterprise contracts, and the company does not disclose ARR.

Name

MailTester.Ninja

Legal name

Unlimited & Limited

Website

https://mailtester.ninja

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

1–10 employees

Short description

MailTester.Ninja is a bootstrapped London-based SaaS platform that verifies and discovers email addresses via a seven-checkpoint SMTP pipeline and a bundled REST API, selling flat-rate daily-cap subscriptions to SMB sales and marketing teams globally.

Ownership category

akta.pro rank

Product category

Email Verification Software

NAICS

Other Computer Related Services (541519), Security Systems Services (56162)

SIC

Computer Terminals (3575)

akta.pro primary industry

Email Authentication & Domain Protection (DMARC/SPF/DKIM) (HDADAKAC)

akta.pro secondary industry

Verification & Risk Signals (Device Fingerprinting, Behavioral Biometrics) (HDADALAJ)

Keywords

• Email verification
• Email finder
• Email validation
• Bounce prevention
• Deliverability tools

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Technology or R&D, Infrastructure, Marketing or Sales, Personnel, Operations

Revenue model

1. Subscription - Flat Daily Cap: Flat weekly or monthly subscription with a daily verification capacity cap that resets every 24 hours. No per-email credit consumption. Plans scale by daily volume (50k, 100k, or 500k per day). Email finder included at no extra cost across all paid plans. No credit pool exhaustion risk.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

MailTester.Ninja is a self-serve SaaS platform that verifies email addresses through seven SMTP-level checkpoints (syntax, domain validity, DNS, MX records, SMTP mailbox confirmation, disposable email detection, catch-all identification, and spam trap screening) and discovers professional email addresses by name and company domain. Verification results are processed in volatile memory and never stored, enabling GDPR-compliant real-time email validation with sub-2-second response times per address.

Product overview

MailTester.Ninja is an email verification and finder SaaS platform consisting of three core offerings: the Email Verifier (for validating existing email addresses), the Email Finder (for discovering professional email addresses), and the Email Checker API (for programmatic access). All paid plans include both the verifier and finder tools with a flat daily capacity cap. The platform runs 7 verification checkpoints including syntax, domain, DNS, MX records, SMTP, disposable email detection, catch-all identification, and spam trap screening. Pricing is structured as tiered flat-rate plans (Starter at $6.99/week for 50,000/day, Pro at $16.99/month for 100,000/day, and Ultimate at $49.99/month for 500,000/day) with no per-email credit costs.

Differentiator

Problem solved

Functional benefit

Brands

• Email Verifier: Core email verification tool that validates email addresses through 7 checkpoints including syntax, domain, MX, SMTP, disposable detection, catch-all identification, and spam trap screening.
• Email Finder
• Email Checker API

Products and services

• MailTester.Ninja Email Verifier Real-time email address verification tool that validates emails across seven checkpoints (syntax, domain, DNS, MX, SMTP mailbox confirmation, disposable email detection, catch-all identification, and spam trap screening) to reduce bounce rates and protect sender reputation. Targeted at sales teams, email marketers, and SaaS operators.
• MailTester.Ninja Email Finder Tool that discovers professional email addresses by first name, last name, and company domain. Each discovered email is verified in the same step, supporting lead generation and outbound prospecting workflows.
• MailTester.Ninja Email Checker API RESTful API for developers to integrate real-time email verification and email finder capabilities into applications, signup forms, and CRM systems. Included on every paid plan.

Quantifiable outcome

• Bounce rate reduced by 98% (achieving sub-1% bounce rate)
• +5 more outcomes

Named customers8 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators8 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• ZeroBounce: ZeroBounce is one of the largest dedicated email verification and deliverability platforms, offering per-credit pricing for email validation, list cleaning, and bounce detection. It is MailTester.Ninja's most direct competitor, with overlapping SMB and enterprise customer bases and the pricing benchmark used in MailTester.Ninja's marketing comparisons.
• NeverBounce: NeverBounce is a dedicated email verification and list-cleaning service serving SMBs and enterprise marketing teams with real-time and bulk validation APIs. It competes directly with MailTester.Ninja across both the web app and REST API surfaces.
• Hunter.io: Hunter.io is a leading email finding and verification platform used heavily by sales and marketing teams for cold outreach. Its combined 'find + verify' workflow closely mirrors MailTester.Ninja's bundled Email Finder and Email Verifier offerings.
• Snov.io: Snov.io provides email finding, verification, and sales automation/CRM tools targeting SMB SDR and marketing teams. Its verification + outreach stack overlaps directly with MailTester.Ninja's verification and email finder functionality.
• Kickbox: Kickbox offers email verification as a core service with both real-time API and bulk verification, plus deliverability tooling. It serves the same sales/marketing and SaaS-signup use cases as MailTester.Ninja.
• Emailable: Emailable is a dedicated email verification SaaS offering bulk list cleaning and real-time API validation. It targets the same SMB and marketing operator customers as MailTester.Ninja with a similar per-list / per-credit pricing model.
• MillionVerifier: MillionVerifier is a budget-focused email verification service built for high-volume bulk list cleaning. It competes with MailTester.Ninja on the same volume-verification use case, particularly for agencies and large senders.
• Debounce: Debounce provides email validation, list cleaning, and an API targeting SMBs and email marketers. Its feature set and customer segment align closely with MailTester.Ninja's mid-market positioning.
• Bouncer: Bouncer is an email verification and deliverability tool offering real-time API, bulk verification, and toxicity checks. It overlaps directly with MailTester.Ninja's verification capabilities and developer-first positioning.

Broad incumbents

• Apollo.io: Apollo.io is a much larger sales intelligence and engagement platform that bundles email finding and verification into its broader prospecting workflow. It is a broad incumbent that absorbs email-verification functionality into a multi-product suite, putting pressure on standalone verifiers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/mailtesterninja
• LinkedInlinkedin.com/company/mailtester-ninja

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about MailTester.Ninja