@adiz @mischievoustomato blocked_instances only blocks messages pushed to you, but it doesn't block messages that your server pulls (for example, when processing a reply), so you might still see them. It also doesn't delete existing posts, it works like a firewall.
The ability to block outgoing requests will be added later. Let me know if this is important.
I also recommend using mitractl add-filter-rule instead of a config file. I haven't documented how this new filtering system works, but you can read about it here: https://www.knthost.com/mitra/create-and-manage-mitra-filters