> When you specify `To: localtesting@aussie.zone` how does the bridge know if you meant `https://aussie.zone/c/localtesting` or `https://aussie.zone/u/localtesting` instead? Good question The process of going from that email-like address to an ActivityPub Actor (https URL) is done by [WebFinger]. So whatever we get back from that lookup is who we send the message to. For example, when we look up `localtesting@aussie.zone` we get this response (truncated for readability): { "rel": "self", "type": "application/activity+json", "href": "https://aussie.zone/c/localtesting", "properties": { "https://www.w3.org/ns/activitystreams#type": "Group" } } The value for `type`, `application/activity+json` tells us that we can send ActivityPub stuff to it. You can play around with WebFinger in the browser. * your account: https://webfinger.net/lookup/?resource=binomialchicken%40lemmy.blahaj.zone * my one: https://webfinger.net/lookup/?resource=otl%40apubtest2.srcbeat.com Hope that makes sense? [WebFinger]: https://webfinger.net/