Question: Fill in the blank. A _____ is a permanent delivery error.
- sender reputation
- hard bounce
- soft bounce
- designated IP address
Explanation
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.
Why the other options are incorrect
sender reputation is the measure HubSpot protects by preventing repeated sends to bounced contacts.
soft bounce indicates a temporary delivery problem, not a permanent one.
designated IP address is a sending infrastructure setting, not a delivery error type.
Source for verification
https://knowledge.hubspot.com/marketing-email/send-emails-to-contacts-who-previously-bounced
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