Email Validation API: Clean Lists, Boost Deliverability & Maximize ROI.
Remove fake emails and spam users from your email lists.
Maria González
I've been using the service for our email validation and it's been incredibly reliable. The interface is intuitive, and we've seen improved delivery rates by 40% since we started using it.
David Thompson
Very quick and easy to configure. Took less than 5 minutes to set up and start validating emails. Exactly what I needed without the complexity of other services.
Isabella Romano
The API integrates seamlessly with our platform. It accurately identifies invalid emails, helping us maintain a clean, active list. Our engagement rates have improved significantly.
Alexandra Kim
Finally found a service that actually delivers on its promise. Cleaned over 50,000 emails from our database and our reputation score has improved dramatically.
Michael Chen
What sets them apart is their excellent customer support. Any questions I had were answered within hours. The validation accuracy is impressive too.
Laura Martinez
Been using it for 6 months now and it's prevented countless spam issues. The real-time validation feature is fantastic for our signup forms.
Maria González
I've been using the service for our email validation and it's been incredibly reliable. The interface is intuitive, and we've seen improved delivery rates by 40% since we started using it.
David Thompson
Very quick and easy to configure. Took less than 5 minutes to set up and start validating emails. Exactly what I needed without the complexity of other services.
Isabella Romano
The API integrates seamlessly with our platform. It accurately identifies invalid emails, helping us maintain a clean, active list. Our engagement rates have improved significantly.
Alexandra Kim
Finally found a service that actually delivers on its promise. Cleaned over 50,000 emails from our database and our reputation score has improved dramatically.
Michael Chen
What sets them apart is their excellent customer support. Any questions I had were answered within hours. The validation accuracy is impressive too.
Laura Martinez
Been using it for 6 months now and it's prevented countless spam issues. The real-time validation feature is fantastic for our signup forms.
Maria González
I've been using the service for our email validation and it's been incredibly reliable. The interface is intuitive, and we've seen improved delivery rates by 40% since we started using it.
David Thompson
Very quick and easy to configure. Took less than 5 minutes to set up and start validating emails. Exactly what I needed without the complexity of other services.
Isabella Romano
The API integrates seamlessly with our platform. It accurately identifies invalid emails, helping us maintain a clean, active list. Our engagement rates have improved significantly.
Alexandra Kim
Finally found a service that actually delivers on its promise. Cleaned over 50,000 emails from our database and our reputation score has improved dramatically.
Michael Chen
What sets them apart is their excellent customer support. Any questions I had were answered within hours. The validation accuracy is impressive too.
Laura Martinez
Been using it for 6 months now and it's prevented countless spam issues. The real-time validation feature is fantastic for our signup forms.
“Mails.so delivers all we need in an email validation service: top security, scalability, performance, and extensive integrations”.
A happy customer, probablyWhat does mails.so exactly do?
tl;dr — Remove invalid recipients, block fake users and bots, prevent fraud, and help you save money.
Place us after your sign up forms and landing pages.
We'll make sure you only get real users.
Use cases for mails.so
If you're running a newsletter, an e-commerce, a SaaS, or marketing campaigns, mails.so is for you.
Email marketing
Protect you from emailing non-existent addresses, which can increase your bounce rate and damage your reputation.
Bot signups
Detect invalid addresses before they register, prevent spam and fake users and keep a high quality user database.
Fraud prevention
Detect disposable email addresses, catch users trying to use multiple accounts and prevent fraud before they can do any harm.
“Mails.so delivers all we need in an email validation service: top security, scalability, performance, and extensive integrations”.
Another happy customer, maybe
No-code integrations with your favourite tools
We've built simple integrations with the most famous no-code tools. Start building today with🧡 Zapier or 💜 Make.
Up and running now, then, and always
We know how important it is to have a reliable service. That's why we've built a rock solid service that has been running with a 99.9% uptime consistently.
Get started with 90% off your first month
All paid plans include API access and list validation. Need extra validations? Top up anytime.
Unlimited
first month (90% off), then full price
- Unlimited validations
- 10 concurrent validations
- Email Finder included
- Mailchimp & HubSpot integrations
- API access & list validation
Business
first month (90% off), then full price
- 50,000 validations / month
- Top-up at 0.002€ / validation
- 5 concurrent validations
- Email Finder included
- Mailchimp & HubSpot integrations
- API access & list validation
Pro
first month (90% off), then full price
- 10,000 validations / month
- Top-up at 0.005€ / validation
- 5 concurrent validations
- Email Finder included
- Mailchimp & HubSpot integrations
- API access & list validation
All plans can be cancelled anytime. No contracts, no hidden fees.
Frequently Asked Questions
Can’t find the answer you’re looking for? Don’t hesitate to get in touch with our customer support team.