correo

The system or service for transporting letters, packages, or electronic messages; also, the actual physical or digital messages themselves. This includes both postal mail and email.

• El correo llega todos los días a la misma hora. — The mail arrives every day at the same time.
• Reviso mi correo electrónico varias veces al día. — I check my email several times a day.
• Envía el paquete por correo urgente. — Send the package by express mail.

The written communication exchanged between people, such as letters or emails; also, the act of communicating through such means. It emphasizes the content or the ongoing exchange.

• Tengo mucho correo pendiente que responder. — I have a lot of pending correspondence to answer.
• Recibí un correo importante de la universidad. — I received an important email from the university.
• Su correo regular me mantuvo informado de todo. — Your regular correspondence kept me informed of everything.