nostr.0xtr.dev is not marked as SpamSafe, that's why I attached that picture, to display which ones are marked as safe from spam. And then I went to settings and turned on the SpamSafe toggle (I didn't know that had to be turned one, but nonetheless I did).

And then I posted that note and immediately got spam replies from nostr.0xtr.dev.

But now I'm thinking that that was because I had to restart Gossip first for the SpamSafe toggle to start working. 

 Yeah that is possible that it needed a restart.  Not ideal.