The Definition
A "Catch-all" (or accept-all) email server is configured to receive all emails sent to a domain,
regardless of whether the specific mailbox exists.
For example, if you send an email to non-existent@company.com, the server will "catch" it
instead of bouncing it back.
Why it matters for B2B
Over 40% of corporate domains (and nearly 70% of Enterprise domains) use catch-all configurations. Traditional verifiers mark these as "Unknown" or "Risky," forcing teams to either delete them (losing valid leads) or send blindly (risking their reputation).
How EmailAddress.ai Solves It
We don't just stop at the server response. Our engine uses Deep-SMTP Analysis to analyze subtle signals from the mail server:
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Latency Fingerprinting - Measuring server response times for true vs. fake mailboxes.
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Historical Behavior - Comparing domain patterns across our billion-record dataset.
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SMTP Greylisting - Intelligently retrying to bypass temporary delivery blocks.
Ready to unlock 40% more inventory?
Stop deleting your most valuable leads. Try our professional catch-all scoring today.
Explore Catch-All Verification