diff --git a/src/Worker/Delivery.php b/src/Worker/Delivery.php
index 3ae0be140d..0d56bfa5d1 100644
--- a/src/Worker/Delivery.php
+++ b/src/Worker/Delivery.php
@@ -19,6 +19,7 @@ use Friendica\Protocol\DFRN;
 use Friendica\Protocol\Diaspora;
 use Friendica\Protocol\Email;
 use Friendica\Util\Strings;
+use Friendica\Util\Network;
 
 require_once 'include/items.php';
 
@@ -158,6 +159,10 @@ class Delivery extends BaseObject
 			return;
 		}
 
+		if (Network::isUrlBlocked($contact['url'])) {
+			return;
+		}
+
 		// Transmit via Diaspora if the thread had started as Diaspora post
 		// This is done since the uri wouldn't match (Diaspora doesn't transmit it)
 		if (isset($parent) && ($parent['network'] == Protocol::DIASPORA) && ($contact['network'] == Protocol::DFRN)) {