Pleroma Blocking Domains
Edit your prod.secrets.exs file. In the section:
config :pleroma, :instance
Add:
rewrite_policy: Pleroma.Web.ActivityPub.MRF.SimplePolicy
Then add this section:
config :pleroma, :mrf_simple,
media_removal: [],
media_nsfw: [],
federated_timeline_removal: [],
reject: [],
accept: []
Description of the different policies can be found here.