invalid address

Undeliverable mail location

An invalid address is a location identifier that doesn't work—either because it's incorrectly formatted, doesn't exist, or can't receive what's being sent.

In computing, an invalid address might be a malformed email or URL: The form rejected my submission due to an invalid address.

For mail, it means the postal service can't deliver there: The package was returned—invalid address.

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mailbox · PO box · returned · return to sender · failed · postal · mail carrier · zip code · zip · street name · street · 404 · missing · rejected · envelope · destination · format · sender

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address validity

invalid addressproper address

Valid delivery location

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