Move up message сustomization callbacks

src/Illuminate/Mail/Mailer.php

@@ -225,13 +225,13 @@ public function send($view, array $data = [], $callback = null)
 
         $data['message'] = $message = $this->createMessage();
 
+        call_user_func($callback, $message);
+
         // Once we have retrieved the view content for the e-mail we will set the body
         // of this message using the HTML type, which will provide a simple wrapper
         // to creating view based emails that are able to receive arrays of data.
         $this->addContent($message, $view, $plain, $raw, $data);
 
-        call_user_func($callback, $message);
-
         // If a global "to" address has been set, we will set that address on the mail
         // message. This is primarily useful during local development in which each
         // message should be delivered into a single mail address for inspection.