diff --git a/bookwyrm/models/federated_server.py b/bookwyrm/models/federated_server.py
index e297c46c..114f387b 100644
--- a/bookwyrm/models/federated_server.py
+++ b/bookwyrm/models/federated_server.py
@@ -28,7 +28,7 @@ class FederatedServer(BookWyrmModel):
     def block(self):
         """block a server"""
         self.status = "blocked"
-        self.save()
+        self.save(update_fields="status")
 
         # deactivate all associated users
         self.user_set.filter(is_active=True).update(
@@ -45,7 +45,7 @@ class FederatedServer(BookWyrmModel):
     def unblock(self):
         """unblock a server"""
         self.status = "federated"
-        self.save()
+        self.save(update_fields="status")
 
         self.user_set.filter(deactivation_reason="domain_block").update(
             is_active=True, deactivation_reason=None
diff --git a/bookwyrm/suggested_users.py b/bookwyrm/suggested_users.py
index cbd33659..953945d1 100644
--- a/bookwyrm/suggested_users.py
+++ b/bookwyrm/suggested_users.py
@@ -207,6 +207,19 @@ def update_user(sender, instance, created, update_fields=None, **kwargs):
         remove_user_task.delay(instance.id)
 
 
+@receiver(signals.post_save, sender=models.FederatedServer)
+def domain_level_update(sender, instance, created, update_fields=None, **kwargs):
+    """remove users on a domain block"""
+    if not update_fields or "status" not in update_fields:
+        return
+
+    userset = instance.user_set.values_list("id", flat=True)
+    if instance.status == "blocked":
+        bulk_remove_users_task.delay(userset)
+        return
+    bulk_add_users_task.delay(userset)
+
+
 # ------------------- TASKS
 
 
@@ -235,3 +248,17 @@ def remove_suggestion_task(user_id, suggested_user_id):
     """remove a specific user from a specific user's suggestions"""
     suggested_user = models.User.objects.get(id=suggested_user_id)
     suggested_users.remove_suggestion(user_id, suggested_user)
+
+
+@app.task(queue="low_priority")
+def bulk_remove_users_task(user_ids):
+    """remove a bunch of users from recs"""
+    for user in models.User.objects.filter(id__in=user_ids):
+        suggested_users.remove_object_from_related_stores(user)
+
+
+@app.task(queue="low_priority")
+def bulk_add_users_task(user_ids):
+    """remove a bunch of users from recs"""
+    for user in models.User.objects.filter(id__in=user_ids):
+        suggested_users.rerank_obj(user, update_only=False)