David Maene enhanced the cypht-org/cypht Email Client by developing a frontend feature that prevents duplicate recipient suggestions in the To, Cc, and Bcc fields during email composition. Using JavaScript and PHP, he implemented validation logic and refined the autocomplete experience to reduce user confusion and the risk of misdirected emails. His approach focused on UI/UX design principles, ensuring that the deduplication process was seamless and reliable for end users. The work included end-to-end traceability from commit to production, demonstrating attention to maintainability and delivery quality. This targeted feature improved both the reliability and usability of the email client interface.