How many days does express mail have before it is returned to the sender?

Express mail typically has a timeframe of 15 days before it is returned to the sender if it cannot be delivered. This policy allows for adequate time for delivery attempts to be made, as express mail is designated for expedited service. Understanding the specific return policy for express mail is crucial for mail clerks to manage undeliverable items efficiently and to communicate effectively with customers about their shipments. The timeframe allows for various circumstances that might delay delivery, ensuring that senders are informed adequately if their mail does not reach the intended recipient.