Since around 2010 I have been running mail servers for myself and other organisations. In this post my notes on how I generally approach this are described. It shows how to set up a modern mail server capable of handling e-mail for multiple domains on Debian 12 “Bookworm”.

Koel (also stylized as koel, with a lowercase k) is a simple web-based personal audio streaming service written in Vue on the client side and Laravel on the server side. Targeting web developers, Koel embraces some of the more modern web technologies – CSS grid, audio, and drag-and-drop API to name a few – to do its job.