- Move EmailAccountDto.cs to Dtos/ (was in EmailAccounts/ subfolder) - Move EmailProfileDto.cs to Dtos/ (was in EmailProfiles/ subfolder) - Keep EmailAttachments/ (3 DTOs) and EmailHistories/ (3 DTOs) subfolders - Update all namespace imports from Dtos.EmailAccounts/EmailProfiles to Dtos - Simpler structure: single DTOs at root, multiple DTOs in subfolders