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A catch-all (accept-all) domain accepts RCPT TO for any local part. Nexiphor marks these addresses as Risky, not Valid — the mailbox may exist, but bounces are still possible.

For outbound campaigns, use the Valid + all catch-alls (use with caution) export preset. Catch-all rows remain Risky because domain-wide acceptance does not confirm an individual mailbox. Unknown verdicts are refunded; we do not guess when the provider withholds a definitive answer.