diff --git a/CONFIGURATION.md b/CONFIGURATION.md
index 4174dd114..6b2821b21 100644
--- a/CONFIGURATION.md
+++ b/CONFIGURATION.md
@@ -49,7 +49,8 @@ Restricts the visibility of posts from certain instances.
       media_removal: [],
       media_nsfw: [],
       federated_timeline_removal: [],
-      reject: []
+      reject: [],
+      accept: []
 
 * `media_removal`: posts from these instances will have attachments 
    removed
@@ -58,6 +59,7 @@ Restricts the visibility of posts from certain instances.
 * `federated_timeline_removal`: posts from these instances will be 
    marked as unlisted
 * `reject`: posts from these instances will be dropped
+* `accept`: if not empty, only posts from these instances will be accepted
 
 ### RejectNonPublic
 
diff --git a/config/config.exs b/config/config.exs
index 5e57af87b..6fc127d4c 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -67,7 +67,8 @@ config :pleroma, :mrf_simple,
   media_removal: [],
   media_nsfw: [],
   federated_timeline_removal: [],
-  reject: []
+  reject: [],
+  accept: []
 
 config :pleroma, :media_proxy,
   enabled: false,
diff --git a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
index 8d770387d..0a047013a 100644
--- a/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/simple_policy.ex
@@ -4,6 +4,15 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
 
   @mrf_policy Application.get_env(:pleroma, :mrf_simple)
 
+  @accept Keyword.get(@mrf_policy, :accept)
+  defp check_accept(actor_info, object) do
+    if length(@accept) > 0 and not actor_info.host in @accept do
+      {:reject, nil}
+    else
+      {:ok, object}
+    end
+  end
+
   @reject Keyword.get(@mrf_policy, :reject)
   defp check_reject(actor_info, object) do
     if actor_info.host in @reject do
@@ -74,7 +83,8 @@ defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
   def filter(object) do
     actor_info = URI.parse(object["actor"])
 
-    with {:ok, object} <- check_reject(actor_info, object),
+    with {:ok, object} <- check_accept(actor_info, object),
+         {:ok, object} <- check_reject(actor_info, object),
          {:ok, object} <- check_media_removal(actor_info, object),
          {:ok, object} <- check_media_nsfw(actor_info, object),
          {:ok, object} <- check_ftl_removal(actor_info, object) do