Keep the uncertainty visible
Do not automatically convert a catch-all response into a confirmed valid result. Preserve the flag and review the context of the contact.
Choose a policy that fits your workflow
A real customer on a catch-all domain may deserve a different follow-up from an address with no known relationship. Verification informs that decision; it does not replace it.
When a domain says yes to everything.
Domain behavior
A domain may accept recipient probes for addresses that do not map to a real inbox.
A separate segment
Keep catch-all records visible instead of merging them with confirmed usable records.
A deliberate policy
Use relationship history, consent, and current sending rules to decide what happens next.
Why catch-all domains complicate verification
Some receiving systems accept many or all recipient names at the domain level. That behavior limits what an external check can establish about one mailbox. A positive acceptance response alone is not enough to prove that the named person has a working inbox.
Avoid both expensive extremes
Treating every catch-all as valid can hide delivery risk. Deleting every catch-all can discard useful relationships. Keep the category intact and assess it alongside the source of the address, recent engagement, and any direct confirmation you already have.
What to record for future review
Retain the category, the underlying reason, the check time, and the decision you made. Rechecking may reveal changed behavior, but repeated checks cannot guarantee that a provider will disclose mailbox-level information.
Questions worth asking
Where do I run a list?
In the app at cp.mailcheckup.net. This site explains the product. The sample report does not check your file.
Does deliverable mean it will hit the inbox?
No. The mailbox server accepted the recipient when asked. It does not predict spam filtering or that a person will read the mail.