MillionVerifier review
The #1 Email Verification Service
MillionVerifier is a GDPR-compliant email verification platform that provides bulk list cleaning, real-time verification APIs and automated list hygiene with a claimed 99%+ accuracy.
Independently researched by the SalesHive team. Ratings are from public review platforms; this page is not sponsored by or affiliated with MillionVerifier. Research last updated December 2025.
What is MillionVerifier?
MillionVerifier is a specialized email verification service designed to help marketers, sales teams and agencies keep their email lists clean and improve deliverability. Operated by GBD Software as a Service Private Limited Company in the EU, it focuses on bulk list cleaning, single-email checks and real-time API verification so that customers can reduce hard bounces and protect their sender reputation.
The platform offers several ways to verify emails: single checks in the web app, bulk verification via file upload or copy-paste, integrations with major ESPs and CRMs, and both single and bulk APIs. Its verification engine performs deep checks including syntax, domain and DNS validation, SMTP handshakes, catch-all and disposable detection, greylisting re-verification, typo correction and classification of results into Good, Risky and Bad categories. MillionVerifier markets a 99%+ accuracy rate backed by a 100% money-back guarantee if hard bounces exceed a specified threshold.
Beyond core verification, MillionVerifier’s EverClean service automates daily list hygiene directly inside connected email marketing tools, unsubscribing or removing invalid and risky addresses without manual exports. The company also bundles free access to EmailAcademy PRO, a toolkit offering blacklist monitoring, inbox testing and educational content about email deliverability.
Founded in 2016, MillionVerifier positions itself as a low-cost alternative to larger verification vendors, emphasizing very competitive, never-expiring verification credits and volume discounts. Its customer base is heavily skewed toward small businesses and agencies that need to verify large volumes of addresses cost-effectively, though it also serves mid-market organizations. While reviews consistently praise its pricing and ease of use, some users note limitations around support responsiveness and occasional performance issues, making it best suited to teams that prioritize price and basic automation over enterprise-grade SLAs.
MillionVerifier key features
Teams typically use it for cold Email Outreach, newsletter and Marketing List Cleaning, sales Prospecting List Verification, and more.
- Bulk email verification. upload TXT, CSV or XLSX files to clean large lists, with automatic duplicate removal and processing speeds up to roughly 1M emails in about 6 hours.
- Single email checker. verify individual email addresses directly in the web app to see if they are Good, Risky or Bad before adding them to your lists.
- Copy-paste list verification. paste raw email lists into the app, which converts them into a file and runs the full verification workflow.
- Real-time verification API (single API). validate emails in real time at signup or form submission, with rate limits around 160 requests per second per IP.
- Bulk verification API. programmatically upload files and retrieve results for large databases, suitable for automation and resellers.
- EverClean automated list cleaning. daily automatic verification of lists inside connected ESP/CRM accounts, removing or unsubscribing bad or risky emails based on rules.
- Smart Verify technology. combines SMTP checks with additional heuristics and sending-behaviour data to reduce unknown and catch-all results and minimize false positives/negatives.
- Comprehensive result codes. classifies addresses as OK, invalid, catch-all, disposable, unknown, free and role, and groups them into Good, Risky and Bad for easier decision-making.
- High claimed accuracy with guarantee. advertises 99%+ verification accuracy and offers a 100% money-back guarantee if hard bounces exceed an agreed threshold after verification.
- Credit-friendly billing. pay-as-you-go credits that never expire, no charges for unknown or catch-all results, and refunds for those statuses in bulk verification.
- Extensive native integrations. direct connectors to dozens of ESPs and CRMs to import lists, verify them and push actions (e.g., unsubscribe invalid emails) back automatically.
- Sub-user management. add colleagues as sub-users to a single account so teams can share credits without sharing logins.
- Advanced account security. multiple API keys with IP whitelisting/blacklisting and optional two-factor authentication via Google Authenticator.
- Notifications and auto top-up. configurable email notifications for low or zero credits, file readiness and file deletion, plus optional automatic top-ups.
- Free EmailAcademy PRO access. bundled access to deliverability tools such as blacklist monitor, inbox tester, SPF/DKIM tester and educational lessons.
What reviewers love, and what to watch
A balanced view of MillionVerifier, drawn from public reviews and product research.
Pros
- Very affordable, pay-as-you-go pricing with low cost per verification and never-expiring credits, often cited as one of the cheapest verifiers on the market.
- Fast bulk processing and API performance, enabling verification of hundreds of thousands to millions of emails within hours for large campaigns.
- Simple, intuitive web interface and workflow, with features like dark mode and clear reporting that make it easy for non-technical users.
- Comprehensive verification logic including syntax, domain and DNS checks, SMTP validation, disposable and catch-all detection and clear Good/Risky/Bad classifications.
- Strong automation and integration options through EverClean, numerous native ESP/CRM connectors and both single and bulk verification APIs, which streamline ongoing list hygiene.
Cons
- Customer support can be slow or inconsistent, with some users reporting response times of 48-72 hours and difficulty resolving billing or technical issues.
- Verification accuracy, while generally good, does not always meet the advertised 99%+ in user experience, with occasional invalid or catch-all emails still slipping through, especially for certain providers like Yahoo.
- User experience can feel spammy or clunky at times, with upsell pop-ups, backend performance slowdowns on large jobs and limits such as a 100MB maximum CSV upload size that require manual workarounds.
MillionVerifier pricing
Published pricing at the time of research. Always confirm current rates with the vendor.
- 10,000 never-expiring email verification credits
- Use for single checks, bulk file uploads, ESP imports and API calls
- Credits not charged for unknown or catch-all results
- 100,000 never-expiring verification credits
- Lower per-email cost for high-volume list cleaning
- Works across bulk uploads, integrations and APIs
- Automated daily verification for up to ~10,000 contacts via integrated ESPs
- Automatic removal or unsubscribing of bad emails from connected lists
- Includes bonus verification credits for ongoing list hygiene
No ongoing free plan; new users can access a one-time trial (e.g., 500 free credits with a business email, up to 10,000 credits via an integration, or a discounted 2,000-credit pack).
Who MillionVerifier is for
A strong fit for
Budget-conscious marketing and sales teams, agencies and SaaS companies that need to clean large email lists regularly, want simple workflows and strong ESP/CRM integrations, and can tolerate basic support and limited compliance certifications in exchange for very low per-email pricing.
Probably not for
Highly regulated enterprises or organizations that require SOC 2/ISO certifications, phone or 24/7 support and strict SLAs, or teams that need the absolute highest verification accuracy and advanced deliverability consulting rather than a lean, low-cost verifier.
How MillionVerifier compares
In the email verification market, MillionVerifier competes primarily on price and practical automation rather than on premium accuracy guarantees or enterprise services. Compared to tools like ZeroBounce, Kickbox or Emailable, it typically offers significantly lower per-email costs and never-expiring credits, making it appealing for agencies, lead-generation shops and small businesses that clean large lists but watch budgets closely. Its EverClean feature and broad ESP/CRM integrations give it an edge over some budget competitors by automating daily list hygiene rather than requiring repeated manual exports and imports.
However, MillionVerifier is generally perceived as a "good enough" verifier rather than the absolute gold standard for accuracy and support. Vendors such as ZeroBounce or Clearout often promote more extensive deliverability analytics, additional data enrichment options and stronger enterprise guarantees, including stricter SLAs and round-the-clock support. MillionVerifier’s mixed reviews around support responsiveness, occasional billing issues and backend performance mean risk-averse enterprises may prefer more established, higher-priced competitors. For organizations that can accept these trade-offs in exchange for aggressive pricing and straightforward automation, MillionVerifier delivers strong value; for those needing the very highest accuracy, detailed reporting and white-glove support, alternatives like ZeroBounce, NeverBounce, Bouncer or Clearout may be a better long-term fit.
Tool research is the easy part. Someone still has to build the lists, write the copy, make the calls, and book the meetings.
Frequently asked about MillionVerifier
The short version is on the surface. Open any question to go deeper.