Certification Aid sends an email to a newly imported List with Subscribers who have no associated Subscriber Key. Which value will become the Contact Key? Choose 1.
When an email is sent to a list where subscribers have no associated Subscriber Key, Marketing Cloud will use the Email Address as the Contact Key by default. This ensures that each subscriber can still be uniquely identified even if they do not have a predefined Subscriber Key.
[: Salesforce Subscriber Key Concepts, , ]
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