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Price clarity grade B, 75 out of 100 clarityFree planMarketing & advertising
In the field guide
mailtester
mailtester.ninja
MailTester.Ninja is a professional email verification and email finder tool that validates email addresses in real-time to reduce bounce rates and improve email campaign deliverability. It offers GDPR-compliant verification without storing verified emails and includes features like anti-spam detection and fast API integration.
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The product, beyond the pitch
Editorially reviewed · Sources checked Sep 15, 2026
A good fit for
- Businesses and marketers aiming to improve email campaign deliverability and reduce bounce rates.
- Users requiring GDPR-compliant email verification without storing verified emails on servers.
Know the limitations
- The free version allows verification of only one email at a time with rate limits depending on server load.
- No API is provided for bulk email address finding due to legal restrictions.
What you can do
- Cleaning up existing mailing lists to reduce bounce rates and improve sender reputation.
- Expanding outreach by discovering new potential contacts and leads with the email finder tool.
Features
- Instant Email Verification to validate email addresses in real-time.
- Advanced Email Finder to discover valid email addresses for business contacts and lead generation.
- Anti-Spam Detection to analyze spam scores and deliverability for marketing optimization.
- Syntax Validation to verify the correctness of email address formats.
- Fast API Integration with a RESTful API for embedding verification and finder capabilities into applications.
Integrations
Not confirmed yet.
Platforms & data export
Not confirmed yet.
mailtester pricing
No plans recorded yet.
THE COST FOR YOUR TEAM
Go beyond the starting price.
Published plan prices for your team size and usage. Results update as you type. Taxes, currency conversion and unlisted add-ons are excluded, and anything the source did not state is called out rather than guessed.
Known monthly subtotal
$0/month
1 of 1 tools could not be priced with these inputs, so this is not the full cost.
| Tool / plan | Monthly | Per year | What this assumes |
|---|---|---|---|
| No pricing recorded yet. Check the official site, or ask the owner to add it. | |||
A practical workflow
- To enable unlimited access, copy your key including curly brackets into the main form.
- Export verification results using the copy or save button to get CSV formatted data for spreadsheets.
- Manage subscriptions and payments through the partner Stripe portal accessible via the 'My Account' menu.
Based on the sources below. Editorial review does not imply hands-on product testing.
Alternatives to explore
Filter alternatives →Candidates based on category and primary feature. Check feature and pricing differences before switching.
Verifying bulk email lists to reduce bounce rates and improve sender reputation. Bulk email list verification to improve deliverability and reduce bounces. Email verification API with simple HTTP API and client libraries for Node.js, Ruby, and Python.
EmailsConfirmed is an email verification tool designed for bulk list cleaning and real-time signup validation to improve deliverability and reduce bounces. It offers unlimited email verifications with a one-time payment model, avoiding subscriptions or usage-based fees.
Marketing & advertisingFree plan
Fonatica is a B2B lead generation tool that finds and verifies business and personal email addresses quickly. It offers tools to discover, verify, and manage email contacts at scale with GDPR compliance and API access.
Sales & CRMAuto-researched
mailtester vs emailablemailtester vs Emailsconfirmedmailtester vs Fonatica
Plan a switch from mailtester →What changed
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