Remove Duplicate Emails

Focus on the technical aspects of designing a solution to identify and remove duplicate email entries from a dataset. Consider the data structure you would use to store the emails and how you would efficiently check for duplicates. Discuss the algorithms that could be applied, such as hashing or sorting, and their time and space complexities. Be prepared to address edge cases, such as handling different casing or whitespace variations in email addresses, and think about how you would implement this solution in a scalable way for large datasets.