What is the difference between express and overnight mail?

The distinction between express and overnight mail is essentially based on the service level and delivery guarantees provided by the mailing service. Express mail typically includes a commitment to deliver packages by a specific time, often providing guarantees on delivery, which can vary depending on the service provider. This feature makes express mail a premium option for urgent deliveries where timing is crucial.

On the other hand, overnight mail generally guarantees that the package will arrive the next day but may not specify a precise delivery time, creating a bit of flexibility in delivery expectations. Customers choosing overnight mail often do so for the assurance that their items will reach their destination quickly, but they may not require the exact timing that express services offer.

This clarity regarding delivery timing is what sets express mail apart, not only in terms of service attitude but also in how it is marketed to customers needing reliable and timely delivery. Thus, the focus on guaranteed delivery by a specific time in express mail versus the general next-day delivery promise of overnight mail highlights their main differences.