Ensuring data consistency requires a combination of best practices and tools: 1. Regular Data Cleaning: Periodically remove duplicate, outdated, or incorrect data from your email lists. 2. Standardized Data Entry: Implement standardized formats for data entry fields to avoid discrepancies. 3. Integration with CRM: Sync your email marketing platform with a CRM system to ensure data is consistent across all touchpoints. 4. Validation Tools: Use data validation tools to check the accuracy and completeness of data at the point of entry. 5. Consistent Update Procedures: Establish and follow regular update procedures to keep your data current.