Verification
Catch-all domain
A mail server configured to accept emails to any address at the domain, making individual mailbox verification impossible.
Definition
A catch-all domain (also called accept-all) is a mail server configuration that accepts emails sent to any address at the domain, whether or not the specific mailbox exists. For example, if example.com is catch-all, both john@example.com and xyz123@example.com would be accepted. This creates verification challenges because SMTP checks can't distinguish valid from invalid addresses. Catch-all is especially common on business domains.
Examples
- Small business capturing all emails to avoid missing messages
- Legacy systems that forward all mail to one inbox
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