Exim

Exim is an open-source email server software that manages sending and receiving emails for organizations or individuals. It operates behind the scenes on a computer, directing email messages to the right destinations, ensuring secure delivery, and handling issues like spam or delivery failures. Think of it as a digital postal service on your server, efficiently managing the flow of electronic mail between users and mail servers across the internet. Designed for flexibility and security, Exim is widely used by businesses and hosting providers to ensure reliable email communication.