electronic mail system

E-mail, or electronic mail, is a system for sending and receiving messages digitally over a network. Users have an electronic mailbox to store and manage correspondence. E-mail can transmit text, graphics, sounds, and animated images simultaneously to individuals or groups. The "@" symbol in an email address separates the user's name from their domain name.12

In contrast, a postal system is an institution, typically government-controlled, that conveys letters, parcels, and packages. It operates through a network of post offices and relies on physical transportation for delivery. While e-mail is digital and instantaneous, the postal system is physical and involves established standards for regularity, speed, and security, with payment usually made in advance via postage stamps.3