Synopsis # Exim is a highly configurable mail transfer agent (MTA) designed for Unix systems. Originally developed at the University of Cambridge, it offers a rich feature set and fine-grained control over mail routing, rewriting, and authentication. Exim is well suited to complex mail environments requiring deep customization. This chapter explains how to install and configure Exim on OpenBSD, covering use cases including local delivery, TLS encryption, relay via a smarthost, and basic conte...
