From e96c159949ee756d45a20ba91457d3eca6c35a6d Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien@potencier.org>
Date: Tue, 11 Sep 2018 08:43:07 +0200
Subject: [PATCH] throw exception when sending on a transport that is not
 started

---
 lib/classes/Swift/Transport/AbstractSmtpTransport.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/classes/Swift/Transport/AbstractSmtpTransport.php b/lib/classes/Swift/Transport/AbstractSmtpTransport.php
index 39b6e2135..d238ba97a 100644
--- a/lib/classes/Swift/Transport/AbstractSmtpTransport.php
+++ b/lib/classes/Swift/Transport/AbstractSmtpTransport.php
@@ -177,6 +177,10 @@ public function isStarted()
      */
     public function send(Swift_Mime_SimpleMessage $message, &$failedRecipients = null)
     {
+        if (!$this->started) {
+            $this->throwException(new Swift_TransportException('Cannot send messages when the transport is not started'));
+        }
+
         $sent = 0;
         $failedRecipients = (array) $failedRecipients;