"Check365 helped us clean a large contact list before a campaign launch. The validation results were accurate and easy to review."
Michael Carter
Email Marketing Manager
Verify every address before campaigns and clean your lists continuously to reduce bounce rates, protect sender reputation, and improve deliverability and engagement across your email programs.
"Check365 helped us clean a large contact list before a campaign launch. The validation results were accurate and easy to review."
Michael Carter
Email Marketing Manager
"The platform is straightforward and reliable. We use it regularly to verify contacts before sending email campaigns."
Priya Patel
Growth Marketing Manager
"We validated thousands of records in a short time. The process was fast and the reporting was clear and useful."
Li Wei
CRM Manager
"The validation process is simple and easy to follow. It helps us maintain a healthier contact database."
Sarah Mitchell
Marketing Manager
"Check365 improved the quality of our prospect lists and helped our team focus on better opportunities."
Rajesh Sharma
Business Development Manager
"The reports are easy to understand and provide the information we need before launching campaigns."
Yuki Nakamura
Demand Generation Manager
"We verify lead lists before outreach and the process is efficient. The platform has become part of our workflow."
Chinedu Okafor
Sales Development Manager
"Check365 saves our team time by helping us identify problematic addresses before sending important emails."
Emily Parker
Marketing Operations Manager
"The platform processes large contact databases quickly and consistently delivers dependable results."
Chen Yuting
Revenue Operations Manager
"The service is easy to use and gives us greater confidence in the quality of our email database."
David Wilson
Marketing Director
"Check365 helps us improve list quality and supports better communication with prospects and customers."
Amina Bello
Customer Acquisition Manager
"We use Check365 before client campaigns. The validation results are clear and help us prepare cleaner lists."
Hiroshi Tanaka
Agency Owner
"Keeping contact data accurate is important for our business. Check365 has been a valuable addition to our process."
Arjun Mehta
Founder
"The platform helped us improve customer email data quality and reduce issues caused by invalid addresses."
Zhang Min
E-commerce Manager
"The validation process is fast, accurate, and easy to understand. It has improved the quality of the leads we work with every day."
James Thompson
Lead Generation Specialist
"Check365 helped us clean a large contact list before a campaign launch. The validation results were accurate and easy to review."
Michael Carter
Email Marketing Manager
"The platform is straightforward and reliable. We use it regularly to verify contacts before sending email campaigns."
Priya Patel
Growth Marketing Manager
"We validated thousands of records in a short time. The process was fast and the reporting was clear and useful."
Li Wei
CRM Manager
"The validation process is simple and easy to follow. It helps us maintain a healthier contact database."
Sarah Mitchell
Marketing Manager
"Check365 improved the quality of our prospect lists and helped our team focus on better opportunities."
Rajesh Sharma
Business Development Manager
"The reports are easy to understand and provide the information we need before launching campaigns."
Yuki Nakamura
Demand Generation Manager
"We verify lead lists before outreach and the process is efficient. The platform has become part of our workflow."
Chinedu Okafor
Sales Development Manager
"Check365 saves our team time by helping us identify problematic addresses before sending important emails."
Emily Parker
Marketing Operations Manager
"The platform processes large contact databases quickly and consistently delivers dependable results."
Chen Yuting
Revenue Operations Manager
"The service is easy to use and gives us greater confidence in the quality of our email database."
David Wilson
Marketing Director
"Check365 helps us improve list quality and supports better communication with prospects and customers."
Amina Bello
Customer Acquisition Manager
"We use Check365 before client campaigns. The validation results are clear and help us prepare cleaner lists."
Hiroshi Tanaka
Agency Owner
"Keeping contact data accurate is important for our business. Check365 has been a valuable addition to our process."
Arjun Mehta
Founder
"The platform helped us improve customer email data quality and reduce issues caused by invalid addresses."
Zhang Min
E-commerce Manager
"The validation process is fast, accurate, and easy to understand. It has improved the quality of the leads we work with every day."
James Thompson
Lead Generation Specialist
EU GDPR Compliant
CCPA Compliant
SOC 2 CompliantCore Framework
Every successful email program depends on four fundamentals: accurate contacts, audience insight, clean data, and deliverability confidence. Check365 helps you strengthen each pillar before every campaign.
01 Validate Contacts
Verify email addresses before they enter your CRM, applications, or workflows. Reduce wasted outreach and maintain higher-quality customer data from the start.
Invalid email
Trusted Email Checker and Verification Platform
By removing the wrong and spammy email addresses, your campaign will be delivered to the right customer and will increase the open rate
As you are not sending to any non-existence email address, your sender reputation will be preserved and will reduce the chance of getting into spam box.
Your investment will not be wasted as you are eliminating the invalid email addresses before sending emails which will increase your ROI.
Our dashboard will show you some advanced insights about your email campaign and how many emails are valid, invalid, and risky.
We ensure all data are handled safely with top-notch security to meet the compliance and data safety

Plug Check365 into your existing workflows with simple, reliable API calls.
Validate individual email addresses or entire lists with fast, reliable API responses built for applications, integrations, and automated workflows. Detect email providers, identify personal and professional accounts, and verify addresses before they impact your campaigns, CRM, or business processes.
cURL
PythonTrusted by teams building applications on:



Integrates With
Connect Check365 to your marketing stack and keep your data pipeline clean from list import to campaign send.
It doesn’t matter what size your business is, our tool will work well for you. Credits pricing are based on the number of email validations you need. and you can buy more credits as you go. the higher the number of credits you buy, the lower the cost per credit.
Popular credit packages
Credits
Enterprise
For businesses that need a more robust solution, and validation at scale.
Check365 works with all types of email systems. Check the validity of emails like Microsoft 365, Gmail, Yahoo!, AOL, etc. and can bring success to your email marketing campaign.
24/7
Customer Support
99%
Percent Accuracy
10M+
Emails Scanned Daily
Have a question? We have the answer. Browse our frequently asked questions to get quick information on our email validation services.
Email validation is the process of verifying that an email address is valid and deliverable. It is an essential step in maintaining a clean and up-to-date email list, reducing bounce rates, and protecting your sender reputation.
Email validation is important because it ensures that your emails reach the right inbox. By verifying email addresses, you can reduce bounce rates, improve deliverability, and protect your sender reputation.
Email validation works by checking the syntax, domain, and mailbox of an email address to ensure it is valid and deliverable. It uses a combination of algorithms and databases to verify the accuracy of an email address.
The benefits of email validation include reduced bounce rates, improved deliverability, and enhanced sender reputation. By verifying email addresses, you can ensure that your emails reach the right inbox and are not marked as spam.
Yes, our API is easy to integrate into your software. We provide comprehensive documentation and support to help you get started quickly and easily.
Grow faster with cleaner customer data.
Get Started Today