The fediverse bridge only posts to relay.mostr.pub, but I discovered the posts "leak" out, a thing the protocol allows. It's possible someone is copying them to other relays for archival purposes, and some clients forwards mentioned events when a user quotes or replies to them. In other words, not it's not possible to block posts that originated on a single relay. (You could block the relay itself by IP). But as #[2] mentioned below, users from the bridge have nip05 identifiers at mostr.pub, a thing added to make detecting them easier. -I created the bridge