diff --git a/application/Espo/Core/Mail/Sender.php b/application/Espo/Core/Mail/Sender.php
index 129e7040a2..b07c96f453 100644
--- a/application/Espo/Core/Mail/Sender.php
+++ b/application/Espo/Core/Mail/Sender.php
@@ -521,11 +521,7 @@ class Sender
                 }
 
                 if (!$hasInlineAttachments) {
-                    $body->addPart(
-                        (new MimePart($alternative->generateMessage()))
-                            ->setType('multipart/related')
-                            ->setBoundary($alternative->getMime()->boundary())
-                    );
+                    $body->addPart($alternativePart);
                 }
             }