Why was my signup rejected with a "disposable email" error?

When the signup form rejects your address with an "unsupported email domain" error, it means the domain you typed in matched an entry in our disposable-email database. Valid Email Checker actively blocks signups from throwaway email services because letting them through opens the platform to abuse — anyone who can spin up a fresh inbox in 10 seconds can also spin up unlimited free accounts to drain the welcome-credit pool.

How the disposable check actually works

The check runs server-side the moment you click Sign Up. We extract the domain from the email you entered, do an indexed lookup against our disposable_email_domains table, and reject the signup with a clear error message if the domain is present. The table contains roughly 10,000 known throwaway providers and is refreshed periodically against public lists plus signals from our own abuse detection. It is the same logic the free email verifier uses when it returns a Disposable result.

Common providers we block at signup

• Mailinator and all its aliases
• 10MinuteMail, 20MinuteMail, and similar timed-inbox services
• GuerrillaMail and its rotating subdomains
• Yopmail
• Trashmail, Sharklasers, Dispostable
• EmailOnDeck, Maildrop, Throwawaymail
• Plus thousands of less-well-known temporary-mail providers

What to do instead

Use a real, persistent email address — either your work address or a personal Gmail, Outlook, iCloud, ProtonMail, or similar mailbox you actually check. We never spam the address you sign up with. The only mail you get from us is the confirmation link, transactional alerts about your verifications, and product update emails you can unsubscribe from in your profile settings.

If you are convinced your domain has been mis-flagged (it is a real corporate domain that happened to land in a public disposable list incorrectly), contact support with the domain and a brief explanation. We review false-positive reports and remove entries that were mis-classified.