Only spool mirrored posts

src/Model/Post/Delayed.php

@@ -92,7 +92,7 @@ class Delayed
 		Logger::notice('Post stored', ['id' => $id, 'uid' => $item['uid'], 'cid' => $item['contact-id']]);
 
 		// It should always contain an URI since this is needed to create a delayed post entry
-		if (!empty($item['uri'])) {
+		if (!empty($item['uri']) && self::exists($item['uri'], $item['uid'])) {
 			$result = self::delete($item['uri'], $item['uid']);
 			Logger::notice('Delayed post entry deleted', ['result' => $result, 'uri' => $item['uri']]);
 		}