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SaaS signup email list cleaning

Paste one trial or demo signup. This free check looks at syntax, the mail server, disposable domains, and shared role accounts. It does not open the mailbox and it does not decide whether the signup is fraudulent by itself.

Syntax, mail server, disposable domain, and role account. The mailbox is not opened. The address is not put in the URL.

Questions

Does this block fraudulent signups?

It flags syntax problems, missing mail servers, disposable domains, and role accounts. A real mailbox check, including catch-all, is POST /verify/email.

How do I run this on yesterday's signups?

POST /verify/email/batch accepts up to 50 addresses. You pay per unique, well-formed address over x402. There is no API key.

Is the signup address stored?

No. Logs record the route and the status, not the address, and the form does not put the address in the URL.