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I've never heard of mailcow specifically, but I was intentionally avoiding all-in-one packages when setting up. Life has proven that good things aren't easy and easy things aren't good.
And so far I'm happy with that decision - setup is modular, was already able to extend it with postfwd, dual dkim signatures (rsa and ed25519), mta-sts and some other policy I can't recall right now.
I've also specifically wanted to run as little code as possible that's exposed to the internet - as such, I chose to not have webmail.
I also hosted my mail directly with Postfix and Dovecot back in the day before the all-in-one packages were a thing.
mailcow has reduced my yearly maintenance from a few hours to a few minutes. Addtionally it runs in Docker, meaning each service is fully isolated and it can be updated with a single command and without headache. Also includes a really handy web interface to configure each of the services, it even does 2FA if you are worried about security.
Have been running it since before it was using Docker and have 0 complaints, it always works and always improves.
Happy it works for you!
I'm running it on arch so that I never have to go through big upgrades. Been over 5 years now - so far, so good!
In regards to docker - it's just a container. You can make any executable run a container. I quite like a lean system myself, though.