Test ⤳ Send ⤳ Control
Email Delivery Platform that delivers just in time. Great for businesses and individuals.
No credit card required
Trusted by 150,000+ monthly active users
Test emails
Use Email Sandbox to inspect and debug emails in staging, dev, and QA environments sending
them to recipients in production
Sign Up for free
Fake SMTP
Catch testing emails from staging. Preview each email in your Maildefiner inbox. Never send test
emails to the users by mistake.
QA Automation
Cover all your testing scenarios with Sandbox API. Integrate with your favorite environment. Run
automated tests and
validate each email.
HTML Check
Validate HTML/CSS of your email templates. See how different popular clients will treat your emails –
on web, mobile, and desktop.