Royal Mail has announced significant changes to its postal services, effective from today, following a directive from Ofcom to reform its operations to better meet public needs. The new rules include a potential reduction in letter deliveries to three times a week and longer delivery times for first-class post. Additionally, to preserve Saturday deliveries, Royal Mail is considering eliminating deliveries on either Tuesday or Wednesday. The company is also proposing cuts to second-class post as a measure to save first-class deliveries.