Glossary

Catch-all

A mail domain set up to accept messages for any address at that domain, whether or not a mailbox exists.

ValidReach Team · Updated 2026-10-26

In practice

A verifier cannot confirm that a person exists on such a domain, because the server says yes to everything. It can only report the address as catch-all.

Treat those addresses as unconfirmed: send a small test batch first and suppress the domain if it later bounces.

Example

Both ana@northwind.example.test and zzz@northwind.example.test are accepted by a catch-all domain.

Verification and sending

ValidReach returns catchall as its own result. See the catch-all verifier for how it is detected.