FYI to new Nostriches. If you see someone posting with a @mostr.pub Nostr address and they don't follow anyone or have any followers, they're not really on Nostr. You're seeing their notes via a Mastodon (Fediverse) bridge.
How can I filter out the bridge?
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God if only.
No client has the ability to mute or hide content from entire Nostr addresses yet.
Pretty sure a client could have simple substring filters