Exim

Exim is an open-source [[Mail Transport Agent (MTA)]], which is a program responsible for routing, delivering, and receiving email messages. It's particularly known for its flexibility and configurability.

Exim is designed to be highly configurable, allowing administrators to tailor it to a wide variety of email environments and needs. Its configuration is known for being more accessible and easier to understand than some other MTAs, like [[Sendmail]].

One of Exim's strengths is its ability to handle different routing configurations and mail processing scenarios, making it suitable for both small and large installations. Security has been a focus in Exim's development, and it includes features to help safeguard against common email threats and vulnerabilities.

Exim provides powerful mechanisms for mail filtering and routing, allowing for detailed control over how email is processed and delivered. Exim benefits from an active community of users and developers, which contributes to its continuous improvement and robust support resources.

Exim is primarily used as an [[Simple Mail Transfer Protocol|SMTP]] server to route and deliver emails on the Internet and within organizations. Due to its flexibility, Exim is often used in environments where customized mail processing is required. Exim can be integrated with various spam and malware filtering tools, making it effective for managing and protecting against unwanted email.

While similar in functionality to other MTAs like Sendmail and [[Postfix]], Exim is often praised for its balance of configurability and ease of use. It's considered more accessible than Sendmail and offers more flexibility in certain configurations compared to Postfix.

Exim's main configuration file is typically located at /etc/exim/exim.conf, and it allows detailed control over all aspects of mail handling. The configuration syntax is designed to be readable and is well-documented, making it easier for system administrators to manage.