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.