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Disposable Email Detection

Disposable (or "burner") emails are temporary addresses that expire after a short time (e.g., 10 minutes). Users often use these to bypass sign-up forms without providing a real address.

CheckEmail.dev maintains a high-performance, in-memory blocklist of over 72,000 disposable domains. This list is updated daily from multiple open-source intelligence feeds.

How it works​

When you validate an email:

  1. We extract the domain (e.g., mailinator.com).
  2. We check it against our blocklist.
  3. If a match is found, we return status: "DISPOSABLE" immediately, without performing further DNS checks. This saves time and ensures instant feedback.

Why block them?​

  • Reduce Churn: Users who use fake emails rarely convert to paid customers.
  • Prevent Abuse: Bad actors often use disposable emails to create multiple accounts for spamming or exploiting free tiers.
  • Clean Data: Keep your CRM and mailing lists healthy.
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