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diff --git a/lib/pleroma/web/activity_pub/mrf/mention_policy.ex b/lib/pleroma/web/activity_pub/mrf/mention_policy.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.MentionPolicy do
+  @moduledoc "Block messages which mention a user"
+
+  @behaviour Pleroma.Web.ActivityPub.MRF.Policy
+
+  @impl true
+  def filter(%{"type" => "Create"} = message) do
+    reject_actors = Pleroma.Config.get([:mrf_mention, :actors], [])
+    recipients = (message["to"] || []) ++ (message["cc"] || [])
+
+    if rejected_mention =
+         Enum.find(recipients, fn recipient -> Enum.member?(reject_actors, recipient) end) do
+      {:reject, "[MentionPolicy] Rejected for mention of #{rejected_mention}"}
+    else
+      {:ok, message}
+    end
+  end
+
+  @impl true
+  def filter(message), do: {:ok, message}
+
+  @impl true
+  def describe, do: {:ok, %{}}
+
+  @impl true
+  def config_description do
+    %{
+      key: :mrf_mention,
+      related_policy: "Pleroma.Web.ActivityPub.MRF.MentionPolicy",
+      label: "MRF Mention",
+      description: "Block messages which mention a specific user",
+      children: [
+        %{
+          key: :actors,
+          type: {:list, :string},
+          description: "A list of actors for which any post mentioning them will be dropped",
+          suggestions: ["actor1", "actor2"]
+        }
+      ]
+    }
+  end
+end