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@@ -452,7 +452,7 @@ class SyncMail {
 
                 $body['text_html'][] = [
                     'body'  =>  base64_encode($item->getBody()->getHtml() ? : $item->getBody()->getText()),
-                    'type'  =>  'text/html',
+                    'type'  =>  $item->getBody()->getHtml()?'text/html':'text/plain',
                     'charset'   =>  'utf-8',
                     'encode'   =>  'base64',
                 ];