Synopsis # Postfix is a full-featured mail transfer agent (MTA) known for its performance, ease of configuration, and strong focus on security. It is available as a package on OpenBSD and can be used as a drop-in replacement for the default smtpd(8) daemon when more advanced capabilities are required, such as compatibility with complex mail environments, detailed policy controls, or extensive logging. This chapter provides a detailed guide to installing and configuring Postfix on OpenBSD, inc...