Fill in the blank. A _____ is a permanent delivery error.
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Correct answer: hard bounce.
Why this is the answer
A hard bounce indicates a permanent delivery problem for a marketing email. HubSpot uses this bounce type when an email cannot be delivered for reasons such as an invalid recipient or recipient not found. Contacts who hard bounce are excluded from future marketing email sends to protect sender reputation . This differs from temporary delivery issues, which HubSpot classifies separately.
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