A catch-all (or accept-all) domain is configured to accept mail for any local-part at that domain. SMTP may say “OK” even when the mailbox does not exist.
Why that matters
If your verifier only trusts a positive RCPT TO, catch-all domains create false positives. You think the address is safe; later the message sits unused or bounces downstream.
How Email Verifier handles it
We flag catch-all behavior when detected so you can:
- Separate “accepted by server” from “known mailbox”
- Score risk differently for outreach vs transactional mail
- Decide whether to send, suppress, or re-check manually
Practical tip
For high-stakes sends, treat catch-all as unknown / risky unless you have another confirmation signal (prior engagement, CRM truth, or double opt-in).