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Mailtester

Vendor: Mailtester

Mailtester verifies and finds email addresses in real time across seven checkpoints, offering bulk processing via API and desktop app, with no stored data and tiered subscription pricing.

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email Cold outreach teams Marketing campaign managers #email verification #email finder #bulk verification

Overview

Mailtester provides an email verification and finder service for teams conducting cold outreach and marketing campaigns at scale. It validates addresses through syntax, domain, and mailbox checks, delivering a confidence score and detailed report. The tool supports bulk processing via a downloadable desktop application and a REST API, enabling integration with CRMs and internal workflows. Its privacy first model ensures verified addresses are never stored, aligning with GDPR requirements. With processing of up to a million emails daily across 159 countries and a reported 99% accuracy, Mailtester serves over 100,000 users and maintains a 4 star Trustpilot rating.

Key Features

Real-Time Verification

Validates syntax, domain, and mailbox deliverability across seven checkpoints, returning a confidence score and detailed report.

Email Finder

Searches for valid business email addresses, enabling discovery and validation within the same subscription.

Bulk Processing App

Downloadable desktop application for processing large email lists and matching results back to the original input file.

Email Checker API

Documented REST API for integrating verification into signup forms, CRMs, and internal tooling.

Deliverability Score

Separate test that scores a sending setup, supported by the company's email infrastructure index.

No Data Retention

Verified addresses are not stored on the company's servers, supporting GDPR compliance.

Pros & Strengths

  • ✓
    Low Cost Per Verification: Flat subscription tiers with daily allowances undercut per credit verification vendors, highlighted by reviewers.
  • ✓
    Fast and Simple: Bulk list verification runs quickly with minimal setup, as noted in Trustpilot feedback.
  • ✓
    Measurable Bounce Reduction: Customers report significant drops in bounce rates after cleaning lists, e.g., from 7.5% to 0.2%.
  • ✓
    No Stored Data: Verified addresses are never retained, simplifying compliance for teams handling third party contacts.

Cons & Tradeoffs

  • ⚠
    Edge Cases Remain Uncertain: Some reviewers observed valid addresses later bouncing; catch all domains lack definitive resolution.
  • ⚠
    Speed Trade Off: Verification can be slower than higher priced premium tools, according to a minority of users.
  • ⚠
    Daily and API Rate Limits: Volume caps apply per plan, requiring throttling or stacked plans for very high throughput workflows.
  • ⚠
    Support Response Times: A few reviewers mention slower replies than the advertised 24/7 support suggests.

Known Limitations

  • • Edge cases such as catch all domains may produce false positives; verification accuracy varies by domain type.
  • • High volume workflows need plan stacking or throttling due to per day verification and API call caps.

Pricing & Plans

Model: subscription

Flat subscription tiers based on daily verification volume. Free web checker with per request limit; paid plans start at $6.99 per week (50k verifications/day) and go up to $49.99 per month (500k verifications/day). Plans can be stacked and support multiple API keys.

✓ Free Plan ✓ Free Trial

Editorial Info

Last Reviewed: 2026-08-20

Verified Sources & Research

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