DragonFly Mail Agent
dma is a small Mail Transport Agent (MTA), designed for home and office use. It accepts mails from locally installed Mail User Agents (MUA) and delivers the mails either locally or to a remote destination. Remote delivery includes several features like TLS/SSL support and SMTP authentication. dma is not intended as a replacement for real, big MTAs like sendmail(8) or postfix(1). Consequently, dma does not listen on port 25 for incoming connections. This package is a fork of the upstream portable version to add in some compatibility code from DragonFly BSD.
Homepage: https://www.dragonflybsd.org/handbook/mta/