Run your own mail server with Postfix, Stalwart, and friends — setup walkthroughs, hardening, and lessons learned.
Stalwart is a single Rust binary that does SMTP, IMAP, JMAP, and web administration. Here is what it actually takes to run it yourself, from a blank VPS to delivered mail.
Postfix is thirty years old and still moves a huge share of the internet’s mail. Here is the configuration that works today, the modern requirements people skip, and when to choose an API provider instead.