A more advanced, reliable MailTester alternative

Meet MailerCheck, the MailTester alternative with superior uptime and more advanced features for in-depth deliverability testing and monitoring.

All-in-one email deliverability solution

Optimize every aspect of email deliverability from a single platform. Access tools for email verification, deliverability monitoring, technical configuration and email content analysis.


Comprehensive campaign analysis

Take control of email content with actionable insights to reduce bounce rates and avoid spam folders. Learn about your SpamAssassin spam score and identify issues with HTML, broken links, incorrect formatting, authentication, and spam phrases


Inbox placement testing for 8 providers

Check where your email campaigns land for 8 major email service providers including Gmail, Yahoo, AOL, Outlook, ProtonMail and more with Inbox Placement. Plus, learn if your campaigns are landing in Gmail’s Promotions tab.

Why is MailerCheck the best MailTester alternative?

Backed by deliverability experts

With 12+ years of experience in marketing and transactional email delivery, we know what it takes to achieve great deliverability.

24/7 customer support

Whether you need help getting started or are having trouble with a feature, our friendly and knowledgeable customer support team is just a click away!

Comprehensive API documentation

Effortlessly integrate MailerCheck with your app or website using the straightforward and regularly-updated API documentation.


User-friendly DMARC reporting

Monitor domain usage in real time and protect your sender reputation and deliverability. Get detailed reports to identify sending sources and troubleshoot issues so you can prevent unauthorized use and resolve SPF and DKIM failures.


Real-time blocklist monitoring

Learn immediately when an IP or domain has been added to an email blocklist. Get instructions and tips on how to get delisted as well as direct links to delisting pages so you can take action right away.

email verification results

Email verification 3 simple steps

Simply upload your email list or import it via integration to the email validation checker and click to verify. Learn which emails are valid, invalid and risky and find catch-all, role-based, disposable, emails with typos and more.


Our email verification solution is integrated with multiple email platforms. Integrate our email verifier to ensure a clean subscriber list before you hit send.

What MailerCheck users think

Join 98,234 happy customers worldwide who are already using MailerCheck.

I handed an intern the initial creation, setup and use of the MailerCheck account and it was a breeze. The setup went smoothly and it only took a couple of hours to do everything until running the email verification.

Pedro P. Verified User, G2 Review

I was introduced to MailerCheck by a friend of mine when I couldn't find a credible solution to help us verify our customer data. We're very conscious of our email marketing and sales email efforts and try to keep a tidy and up-to-date CRM. MailerCheck is a vital part of this process and it's been so easy to onboard and use their solution on a regular basis to ensure high accuracy of email delivery with our campaign.

Amir Jirbandey Head of Growth, Papercup

I used this with my MailerLite account and it was effortless to work with. It definitely cleaned my list up, I saw a notable (positive) difference in my open rate after cleaning. Very straightforward process and billing.

Verified reviewer G2, Reviewer

Why is MailerCheck a superior alternative?

Inbox Insights
SPF Validation
DKIM Validation
IP Blocklist check
Spam filter check
Email HTML check
Email links check
Email images check
Spam content check
Inbox Placement
Gmail (Inbox, Spam, Promotion)
DMARC Reports
DMARC generator
Instant alerts
DMARC recommendations
DMARC Reports
Mail source monitoring
Blocklist Monitoring
IP address monitor
Domain monitor
Email alerts
Webhook alerts
Delisting button
Delisting instructions
Email List Verification
Single address verification
Bulk email verification
Real-time API verification
Invalid email detection
Catch-all emails detection
Disposable emails detection
Syntax error detection
Mailbox full detection
Role based emails detection
Past delivery errors detection
Typo detection
Mailbox blocked detection

Ready to use a faster, better email verification tool?

Sign up to MailerCheck for free and get 200 free credits to start off with plus access to email marketing optimization tools such as Email Insights and Inbox Placement.

How many credits do you need?
Pay as you go
1,000 credits $ 0.01 per credit
Taxes may apply, learn more.

$275 /mo

Taxes may apply, learn more.
Sign up

$125 /mo

Taxes may apply, learn more.
Sign up

$0 /mo

Sign up

$975 /mo

Taxes may apply, learn more.
Sign up

Ready for better email deliverability?

Sign up to MailerCheck for free and get 200 free credits to start off with plus access to email verification testing and our real-time email validation API.