Index: /controller/wpsg_ShopController.class.php
===================================================================
--- /controller/wpsg_ShopController.class.php	(revision 7697)
+++ /controller/wpsg_ShopController.class.php	(revision 7698)
@@ -3400,5 +3400,7 @@
 			
 			$this->callMods('sendMail', array($mail_key, $o_id, $k_id, &$empfaenger, &$subject, &$mail_text_send, &$headers, &$anhang));
-
+			 
+			\apply_filters('wpsg_sendMail', [$mail_key, $o_id, $k_id, &$empfaenger, &$subject, &$mail_text_send, &$headers, &$anhang]);
+            
 			wp_mail($empfaenger, $subject, $mail_text_send, $headers, $anhang);