---
title: "What is Catch-all?"
url: "https://lookvalid.com/glossary/catch-all.md"
canonical_url: "https://lookvalid.com/glossary/catch-all"
last_updated: "2026-10-23"
type: "conceptual"
summary: "A catch-all domain accepts mail sent to any address at the domain, whether or not a mailbox exists."
related: ["https://lookvalid.com/glossary/smtp-verification.md", "https://lookvalid.com/glossary/hard-bounce.md", "https://lookvalid.com/glossary/role-account.md", "https://lookvalid.com/products/email-domain-check.md"]
---

# What is Catch-all?

A catch-all domain accepts mail sent to any address at the domain, whether or not a mailbox exists.

That defeats mailbox verification: the server says "yes" to every address, so a check cannot tell a real person from a typo. Verification services report these as "accept all" or "risky".

Catch-all setups are common on small business domains. Treat them as unknown rather than as valid or invalid.

A common way to handle a catch-all domain is to accept the address, tag it, and watch the first message. If that message bounces later, suppress the address. Sending a short confirmation email to prove that someone reads the mailbox is the dependable test, because no outside check can see past the server's blanket acceptance.

## Related

- [What is SMTP verification?](https://lookvalid.com/glossary/smtp-verification.md)
- [What is Hard bounce?](https://lookvalid.com/glossary/hard-bounce.md)
- [What is Role account?](https://lookvalid.com/glossary/role-account.md)
- [Email Domain Check API](https://lookvalid.com/products/email-domain-check.md)