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Deliverability

Catch-All Detection

The process of identifying email servers that accept all messages sent to a domain, regardless of whether the specific mailbox exists.

Catch-all detection refers to techniques used to determine if a domain's mail server is configured to accept emails for any address, even non-existent ones. This matters because sending to catch-all domains can inflate bounce rates and harm sender reputation, as many of those addresses may be invalid or unmonitored. Identifying catch-all domains allows senders to filter them out or handle them separately to maintain list hygiene.
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