From 3d25c1c613ba31e7dd8b26c8b48bdaa21b995152 Mon Sep 17 00:00:00 2001
From: Fabien Potencier <fabien@potencier.org>
Date: Sat, 30 Mar 2019 14:46:29 +0100
Subject: [PATCH] [Mailer] fixed SMTP support when a message cannot be sent

---
 .../Component/Mailer/Transport/Smtp/SmtpTransport.php     | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php b/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php
index 54f5e2a09655..7c3e074aee33 100644
--- a/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php
@@ -111,7 +111,13 @@ public function send(RawMessage $message, SmtpEnvelope $envelope = null): ?SentM
             $this->start();
         }
 
-        $message = parent::send($message, $envelope);
+        try {
+            $message = parent::send($message, $envelope);
+        } catch (TransportExceptionInterface $e) {
+            $this->executeCommand("RSET\r\n", [250]);
+
+            throw $e;
+        }
 
         $this->checkRestartThreshold();