Email validation
Email validation for signup forms
Catch throwaway inboxes, typos and dead domains before they become accounts. One check per address, with the fix when it is a typo.
- 30,000 free requests a month
- 1 request per address
- Only the domain is logged
Fixed to jane@gmail.com, then created
Accounts created
1,284
Stopped at signup
317
What it checks
Five checks in one call
They run in this order and stop at the first hard failure.
- 1
Format
Syntax and length, read the way mail servers read them.
- 2
Throwaway domains
About 10,000 disposable domains, refreshed every day.
- 3
Mail server
The domain must publish MX records. Answers are cached for 6 hours.
- 4
Typos, with the fix
gmial.com comes back with gmail.com, ready for a "did you mean".
- 5
Role addresses
info@, admin@ and support@ come back risky, so you decide.
Signup Gate
Every signup, checked as it is submitted
Signup Gate puts this check on your form, with the bot and VPN checks, in the verify call your server already makes. Fake addresses and scripted signups never become accounts.
Did you mean jane@gmail.com?
The answer
Every address gets one of four answers
Each one carries its reason, so your form can say what to fix.
- maria@northwind.io
Valid. Well formed, a real mail server, nothing flagged.
- jane@gmial.com
Risky. A throwaway domain, a typo or a role address. The reason says which, and a typo comes with the fix.
- sam@northwind.example
Invalid. Bad format, or a domain that takes no mail.
- lee@slow-dns.example
Unknown. DNS did not answer in time. Retry, or let the signup through.
FAQ
Common questions
Start checking signup emails
Create a free account, copy your key and send your first address. The Free plan includes 30,000 requests a month.