I don't think this is yet possible in the Lemmy protocol itself.
There are hacky ways to do it through a frontend that can only block communities. Any time a post appears from that instance, automatically block the community and hide the post. I don't know if jerboa would prefer to wait until a more elegant solution is possible and/or leave it to the user though.
If I built it, I would just filter it out as it comes in. So don't send anything to the server, just hide stuff. That seems like the least surprising behavior.
I don't think this is yet possible in the Lemmy protocol itself.
There are hacky ways to do it through a frontend that can only block communities. Any time a post appears from that instance, automatically block the community and hide the post. I don't know if jerboa would prefer to wait until a more elegant solution is possible and/or leave it to the user though.
If I built it, I would just filter it out as it comes in. So don't send anything to the server, just hide stuff. That seems like the least surprising behavior.