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Comprehensive and Detailed Explanation:

To validate postal codes and ensure accurate data entry, Salesforce allows the use of the VLOOKUP function within validation rules. This approach involves creating a custom object containing valid postal codes and configuring a validation rule that references this object to verify the entered postal code.

From Coefficient:

"Craft a validation rule employing the VLOOKUP formula on the Accounts object. This rule checks the account’s postal code against the ZipCode__c object, leveraging lookup_value and objecttype parameters to ensure accuracy."

—How to Use the Salesforce VLOOKUP Function

By implementing this method, Cloud Kicks can prevent the entry of invalid postal codes, maintaining data integrity across international addresses.