Catch-all domains accept every address, so basic checkers wrongly mark them "valid". Our engine detects accept-all domains and flags them honestly, so a risky address is never reported as a sure thing.
Verify catch-alls free Clean a list 100 free credits, no card. No surcharge for catch-all detection.A catch-all server says "yes" to every address. The difference between tools is whether they admit that.
Mailbox confirmed on a normal domain. Safe to send.
The address does not exist. Remove it before sending.
Accept-all domain. We tell you it is catch-all instead of pretending it is confirmed.
Catch-all domains are everywhere in B2B. A tool that reports them as "valid" inflates your deliverable count and quietly sets you up for bounces and spam complaints. Knowing an address is catch-all lets you treat it as the calculated risk it is.
We combine MX analysis with live SMTP behavior to recognise when a domain accepts mail for addresses that cannot exist, then label the result clearly. The same SMTP verification that confirms normal mailboxes is what exposes accept-all domains.
It runs inside the standard 16-point check, in real time at the API or in bulk on a list, so catch-all handling is automatic everywhere you verify.
Everything about verifying catch-all addresses.
A catch-all (or accept-all) domain is configured to accept mail sent to any address at that domain, even mailboxes that do not exist. Because the server says yes to everything at the SMTP layer, you cannot tell from a single check whether a specific mailbox is real.
Email Verifier API detects when a domain is catch-all and returns an "unknown" status rather than a false "passed". It combines MX analysis, SMTP behavior and reputation signals so you know the address sits on an accept-all domain and can decide how to treat it, instead of being misled into thinking it is confirmed deliverable.
Sometimes. Many catch-all domains do route to real inboxes, but some silently discard mail to non-existent addresses. The safe approach is to segment catch-all results, send to them carefully, and watch engagement, rather than mixing them with confirmed-deliverable addresses.
Because the mail server accepts the address, a basic checker reads that as "valid". That is misleading. Our engine flags the catch-all condition explicitly so a risky address is never reported as a sure thing.
They are very common in B2B, where many company domains are configured to accept all addresses. That is exactly why honest catch-all handling matters for anyone verifying business contacts.
No. Catch-all detection is part of the standard 16-point check at one credit per verification. Some budget tools add a large surcharge for it; we do not.
See exactly which of your contacts sit on catch-all domains. Start with 100 free credits, no credit card.
Verify your list freeRelated: SMTP email verification and disposable email detection.