BillionMail · Self-Hosted Email

BillionMail

Self-hosted email server and marketing platform built on Postfix, Dovecot and Rspamd, bundling newsletter and transactional sending with delivery and engagement analytics plus RoundCube webmail. Installation is an eight-minute script, Docker Compose, or an aaPanel one-click. AGPLv3 with 15,500+ stars, sold on the argument that subscriber data and sending reputation should sit on hardware you control rather than behind a SaaS subscription.