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Salesforce MCE-Dev-201 Exam - Topic 5 Question 13 Discussion

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.
B) Email address
A) ContactID
C) Subscriber ID
D) Unique random number

Salesforce MCE-Dev-201 Exam - Topic 5 Question 13 Discussion

Actual exam question for Salesforce's MCE-Dev-201 exam
Question #: 13
Topic #: 5
[All MCE-Dev-201 Questions]

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.

Show Suggested Answer Hide Answer
Suggested Answer: B

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


by Essie at Jun 17, 2026, 06:43 PM

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Beth
4 days ago
I think it's B) Email address.
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Shawna
9 days ago
I practiced a question like this before, and I think it was about using the ContactID, but I can't recall the details.
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Jonell
14 days ago
I feel like it could be a unique random number, but that seems less likely for a contact key.
upvoted 0 times
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Virgilio
19 days ago
I'm not entirely sure, but I remember something about Subscriber ID being used in similar scenarios.
upvoted 0 times
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Afton
24 days ago
I think the Contact Key might default to the Email address since it's the most common identifier for subscribers.
upvoted 0 times
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