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I might have a reason to learn #Docker soon. https://mailu.io/1.7/ though I'm really tired of easy-set-ups for mail servers. Inevitably, after you've been running it for a few months, there's an upgrade. And since you used an easy-set-up, you don't have much understanding of how things are configured, so when the upgrade breaks something, you have to scrap your mail service and start over.
The better choice, IMO, is for someone to write a mail server that does secure and spam-resistant things out of the box, without a complicated configuration file that the admin can mess up.