MailCheck.ai
Prevent users to sign up with temporary email addresses
- Authentication
- No auth
- HTTPS
- Yes
- CORS
- Unknown
- Category
- Documentation / URL
- https://www.mailcheck.ai/#documentation
Overview
MailCheck.ai detects disposable email domains — a free, keyless JSON API that was popular for signup filtering.
⚠️ Status (verified 2026-08): requests to
app.mailcheck.aireturned HTTP 301 redirects (no working endpoint reached in our test). The service appears to be having issues — verify from your network before relying on it.
What it used to provide
curl "https://app.mailcheck.ai/email/test@gmail.com"{ "email": "test@gmail.com", "disposable": false, "user": "test", "domain": "gmail.com" }Alternatives
- Kickbox open and Disify (both listed on this site) — verified working disposable-domain checks.
FAQ
Is MailCheck.ai working? Our 2026-08 test got redirects instead of data — verify availability from your network.
Was it free? Yes — it was free and keyless.
What did it return? Disposable-domain flags for an email.
More in Email
| API | Auth | HTTPS | CORS | |
|---|---|---|---|---|
| AGPC Domain Check Check a domain's SPF, DKIM, DMARC and MX with a graded shareable report | No auth | Yes | Yes | ↗ |
| Atomic Mail Email for AI agents: programmatic inbox creation and send/receive over JMAP | API Key | Yes | Unknown | ↗ |
| Cloudmersive Validate Validate email addresses, phone numbers, VAT numbers and domain names | API Key | Yes | Yes | ↗ |
| Disify Validate and detect disposable and temporary email addresses | No auth | Yes | Yes | ↗ |
| DropMail GraphQL API for creating and managing ephemeral e-mail inboxes | No auth | Yes | Unknown | ↗ |