This question runs in a pre-configured Salesforce environment - no personal connection required.
Query the Contact object and return a list of Ids for every Contact whose Email field is null. The order of the returned Ids does not matter.
Examples:
Input: (none)
Output: [003xx000004TmiQ, 003xx000004TmiR, ...]
Explanation: All Contacts with no Email value are returned
Input: (none, no contacts missing Email)
Output: []
Explanation: An empty list is returned when every Contact has an Email
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