To ensure only a single record per email address is sent, what should the engineer do with the profile attributes?

When dealing with the necessity to ensure that only one record per email address is sent, the most effective approach involves implementing deduplication by email address, along with a unique identifier such as CRM_id. This method focuses on identifying and eliminating any duplicate records that share the same email address, which is crucial since email addresses are often used as primary keys for communications.

By utilizing both the email address and CRM_id in the deduplication process, the system can effectively distinguish between duplicate entries related to the same email address that may exist due to other variations (like user updates, multiple accounts, etc.). This practice ensures that only a single, most relevant record is retained for each email address, reducing the risk of sending multiple communications to the same recipient and thus maintaining cleaner data integrity.

The inclusion of CRM_id further enhances the deduplication process by providing an additional layer of uniqueness, allowing the engineer to keep the most important or updated record while discarding any unwanted duplicates. This is essential in situations where customer records evolve or change over time in customer relationship management systems.