Why the distinction matters
A positive-looking server response is not always proof that the intended person has an inbox at that address. Treating every catch-all result as confirmed valid can hide uncertainty.
Is every catch-all address unusable?
No. Real people can use addresses on catch-all domains. The limitation is what the verification check can establish, not a universal statement about every address on that domain.
What should you review?
Consider where the address came from, your relationship with the contact, previous legitimate interactions, and the reason supplied by the verification tool. Maintain existing suppression and consent requirements.
What should a tool tell you?
Look for an explicit flag, a plain explanation, and documented classification rules. Avoid assuming a numeric score resolves an uncertainty that the underlying evidence cannot establish. Next: Read the results guide and the unknown-results explanation.
The decision is about uncertainty
Imagine an established customer whose domain accepts every recipient probe. That domain behavior does not erase your existing relationship, but it does limit what this check proves. Context matters more than a binary shortcut.
Review with a consistent policy
Document the source of the address, recent direct interaction, and the verification time. Keep consent and complaints authoritative. Do not turn repeated testing into a claim of guaranteed delivery.
Review one representative record with your team. Agree on the evidence, the decision, and who owns the next step before applying the same rule to a complete list.