Exim is a powerful, open-source mail transfer agent (MTA) designed for managing email delivery efficiently and securely. It supports a wide range of mail protocols and is widely used for handling large-scale email environments.

Features of Exim:

• Support for various mail protocols including SMTP, POP3, and IMAP.
• Flexible configuration for handling complex email routing and delivery scenarios.
• Advanced filtering and spam prevention features to enhance email security.
• Scalable architecture suitable for high-volume email environments.
• Integration with popular mail servers and external services like LDAP, MySQL, and others.
• Comprehensive logging and tracking capabilities for monitoring email traffic.

Disclaimer: Exim is released under the Exim Public License (EPL). Users are responsible for understanding the licensing terms and ensuring compliance. Exim is provided "as is" without any warranty.