MailerCheck
Email list verification and deliverability testing tool — clean your list and ensure emails land in the inbox.
| What is it | Email list verification and deliverability testing tool — clean your list and ensure emails land in the inbox. |
|---|---|
| Pricing | Freemium — from $9/mo |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Works with | Integrately, Make, Zapier |
| Best for | Cleaning an email list before a large campaign to improve open rates, Diagnosing why marketing emails are going to spam folders |
| Domain registered | 2014 |
Data updated Aug. 1, 2026
What does MailerCheck do?
MailerCheck is a tool designed to help email marketers improve their campaign performance. Its primary job is to verify email lists and test how well emails will be delivered. You upload a list of email addresses, and MailerCheck checks each one for validity, identifying those that are fake, inactive, or likely to cause spam complaints. This process helps you remove bad addresses that hurt your sender score and waste your budget.
Beyond list cleaning, MailerCheck's other major function is deliverability testing. You can send a test version of your email campaign through the tool. It then shows you a preview of how your email will look in different inboxes like Gmail, Outlook, and Yahoo. More importantly, it analyzes your email content for common spam triggers and gives you a sender reputation score. This helps you spot problems—like a misleading subject line or broken authentication—before you hit send to your entire list.
The tool is most useful for anyone who sends email campaigns regularly. Marketing teams at small businesses can use it to ensure their newsletters reach customers. Agencies managing multiple client accounts can use it to maintain high deliverability rates across the board. By catching invalid emails and spam filter issues early, MailerCheck helps users protect their sender reputation, which is key for long-term email marketing success.
Key features
What makes it stand outWho is MailerCheck for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardFree
- 100 emails
- 100 free email verifications per month
- Basic email validation
- CSV uploads
- Real-time API access
Starter
Everything in Free, plus:
- 1,000 emails
- 1,000 email verifications per month
- All Free features
- Priority support
Growth
Everything in Starter, plus:
- 5,000 emails
- 5,000 email verifications per month
- All Starter features
- Advanced analytics
Pro
Everything in Growth, plus:
- 20,000 emails
- 20,000 email verifications per month
- All Growth features
- Dedicated account manager
Enterprise
Everything in Pro, plus:
- Custom email verification volume
- Advanced security features
- 24/7 priority support
- Custom SLAs
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