emailOne account per inbox
Every spelling of the same inbox returns the same canonical address. Store it in a unique column and aliases can no longer open extra accounts.
[email protected]"email": "[email protected]"
Email validation API for signup forms
Stop fake, duplicate and throwaway signups with one API call.
Send the email a user typed into your signup form. Signitize answers with the canonical inbox to catch duplicate accounts, whether the domain is a disposable (temporary) email provider, and whether the address can receive mail at all.
Free plan: 2,500 checks per month. No credit card.
Request
curl https://api.signitize.io/v1/check \
-H "Authorization: Bearer sk_live_..." \
-H "Content-Type: application/json" \
Response
{
"disposable": false,
"deliverable": true
}
Three signup problems, three fields
disposableNo throwaway signups
Temporary and throwaway mail domains are flagged, including new ones detected from their DNS setup, so nobody farms your free tier.
[email protected]"disposable": true
deliverableNo mistyped or made-up addresses
Addresses that can never receive mail are caught: domains that do not exist or accept no mail, and usernames the provider never allows.
[email protected]"deliverable": false
How it works
1
Call it from your backend
One POST before you create the account. Known providers and known throwaway domains are answered without a DNS lookup.
2
Reject or continue
Reject throwaway and undeliverable addresses with a clear message. Check email against your users table for duplicates and bans.
3
Verify as usual
Send your verification email to the address the user typed. If the API is unreachable, fail open.