Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software, open to suggestions and external contributions. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware.
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This is how Kat Marchán (tech lead/architect) replaced its entire usage of htmx with a tiny, 100-line, vanillajs web component.