Catch-All Address

A catch-all address (or wildcard mailbox) receives all mail sent to a domain that does not match a real mailbox or alias. Mail to anything@example.com ends up in a designated inbox instead of bouncing.

Why it matters

It prevents lost mail from typos and lets you create throwaway addresses on demand. The downside is spam: harvesters and dictionary attacks send to made-up names, and everything arrives in one place. It also hides mistakes, because a misspelled address that would have produced a 550 user unknown bounce is silently accepted. Some senders and list hygiene tools cannot tell if an address is valid on a catch-all domain, so verification becomes unreliable.

Example

sales@example.com   -> mailbox (real)
*@example.com       -> inbox of jane@example.com (catch-all)

A customer who types saels@example.com still reaches Jane. So does a spammer who guessed admin@example.com, so filter the catch-all inbox strongly.

Common mistakes

• Enabling it on a domain with heavy spam and no filtering.
• Relying on it instead of creating the real aliases you need.
• Expecting email bounce feedback for invalid recipients, which it suppresses.

Related

• Email Alias
• Email Bounce
• List Hygiene
• Mail Server
• टूल: MX lookup

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