Discourse's official Discord server?

Yes it can. You will need to configure a reverse proxy to direct traffic if you do that.

I’d recommend:

  1. Install Discourse following the official install.
  2. Make sure Discourse works.
  3. Follow the howto here on Meta for configuring an nginx proxy.
  4. Make sure Discourse still works.
  5. Install Mattermost.
  6. Add the necessary Mattermost config to the nginx proxy.
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