Yeah the standalone.yml is for if you have to use a non standard port and proxy on your webserver. For example I have it running on 127.0.0.1:3000 and nginx proxies it to 443 because I have 6 websites running on the same server so nginx can have many websites on the same IP address. discourse_docker/samples/standalone.yml at main · discourse/discourse_docker · GitHub
Yeah running your own mail server on port 25 these days isn’t a great idea most email providers have blacklisted entire vps subnets.
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