+10.572 users
Simple, fast
, and secure
email validation service

Email Validation API: Clean Lists, Boost Deliverability & Maximize ROI.

Remove fake emails and spam users from your email lists.

99.99% availability
Get started for free
Deliverable

This email address is valid

25
50
75
0
100

Or instead
Crown

“Mails.so delivers all we need in an email validation service: top security, scalability, performance, and extensive integrations”.

AvatarA happy customer, probably

What does mails.so exactly do?

tl;dr — Remove invalid recipients, block fake users and bots, prevent fraud, and help you save money.

Format check
Delivery check
Email profiling
Blocklists
No-code APIs
Mailing lists

Place us after your sign up forms and landing pages.
We'll make sure you only get real users.

2-3% of users make spelling mistakes
3-4% make up their address on signup
~2% are spam signups with fake addresses
~1% use temporary or catch-all addresses

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.

Bounce rate

Bot signups

Detect invalid addresses before they register, prevent spam and fake users and keep a high quality user database.

Bot signups

Fraud prevention

Detect disposable email addresses, catch users trying to use multiple accounts and prevent fraud before they can do any harm.

Fraud detection
Crown

“Mails.so delivers all we need in an email validation service: top security, scalability, performance, and extensive integrations”.

AvatarAnother happy customer, maybe

Integrations

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.

Get started
Reliability

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.

Start for free
Service status
Operational
mails.so100.00% uptime
API99.993% uptime

Get started with 85% off your first month

All paid plans include API access and list validation.
Need extra validations? No problem. We've got you covered.

Enterprise

$1,899
per user
per month
  • Enable list validation
  • Unlimited validations
  • 99.99% Guaranteed Uptime SLA
  • Priority support

Unlimited

$249$37.35
per user
per month
  • Enable list validation
  • Unlimited validations
Most popular

Business

$49$7.35
per user
per month
  • Enable list validation
  • 50,000 validations per month included
  • $0.002 per extra validation

Pro

$24$3.60
per user
per month
  • Enable list validation
  • 10,000 validations per month included
  • $0.005 per extra validation

Frequently Asked Questions

Can’t find the answer you’re looking for? Don’t hesitate to get in touch with our customer support team.