What is a catch-all domain, and why do verifiers give up on it?

Catch-all (accept-all) domains accept mail for every address — so a normal SMTP probe can't tell valid from invalid. Here's how resolution actually works.

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Why this matters

Email verification only helps if it's honest. Throughout the CorrectInbox product we return a confidence score and admit “unknown” when a catch-all genuinely can't be resolved — rather than inflating results with a guessed “valid.”

That same principle shapes how we write: practical, specific, and free of the deliverability myths that make lists worse, not better.

Put it into practice

The fastest way to understand verification is to run your own list through it. Start free with 100 verifications — no card required.