diff --git a/contrib/mitra_config.yaml b/contrib/mitra_config.yaml
index 8697fb2..de19d58 100644
--- a/contrib/mitra_config.yaml
+++ b/contrib/mitra_config.yaml
@@ -23,6 +23,9 @@ registrations_open: false
 
 #post_character_limit: 2000
 
+# List of blocked domains
+#blocked_instances: []
+
 # Blockchain integration
 #blockchain:
 #  chain_id: eip155:31337
diff --git a/src/activitypub/receiver.rs b/src/activitypub/receiver.rs
index 9d9aadf..d0c8664 100644
--- a/src/activitypub/receiver.rs
+++ b/src/activitypub/receiver.rs
@@ -170,7 +170,8 @@ pub async fn receive_activity(
     let signer_id = signer.actor_id(&config.instance_url());
     log::debug!("activity signed by {}", signer_id);
     if config.blocked_instances.iter().any(|instance| signer.acct.contains(instance)) {
-        return Err(HttpError::ValidationError("instance is blocked".into()));
+        log::warn!("ignoring activity from blocked instance: {}", activity_raw);
+        return Ok(());
     };
 
     let maybe_object_type = match (activity_type.as_str(), maybe_object_type) {