If you forward external traffic to the gladden pageserver interface, external users can also post to your node by proxy. However there was no way to avoid them having control over things you might not want them to, like watching or unwatching boards, moderating content on your behalf, etc. So, now with the latest version there are some settings in config/gatewayMode.json to allow control over this. For example (with posting and moderation actions disabled), here's one on peerchan.net: https://gladden.peerchan.net/landing/index.html
/landing/
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