Data Preparation: Ensure that your data is clean and formatted correctly. Remove any duplicates and invalid email addresses. File Formatting: Most platforms accept CSV files, so make sure your data is saved in this format. The file should include columns for email addresses and any other relevant information such as names, locations, or subscription preferences. Upload: Use your email marketing platform’s import feature to upload the file. Most platforms provide a user-friendly interface for this step. Field Mapping: Map the columns in your CSV file to the fields in your email marketing platform. This ensures that the data is imported correctly. Validation: After the upload, most platforms will validate the data. They may flag any issues such as duplicate entries or invalid email formats.