symfony
diff --git a/‎src/Symfony/Component/Mailer/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Mailer/Tests/Transport/Smtp/EsmtpTransportFactoryTest.php
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+14Lines changed: 14 additions & 0 deletions b/‎src/Symfony/Component/Mailer/Tests/Transport/Smtp/EsmtpTransportFactoryTest.php
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diff --git a/‎src/Symfony/Component/Mailer/Transport/Smtp/EsmtpTransportFactory.php
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@@ -36,6 +36,7 @@ CHANGELOG
  * Added `Symfony\Component\Mailer\Test\TransportFactoryTestCase` to ease testing custom transport factories.
  * Added `SentMessage::getDebug()` and `TransportExceptionInterface::getDebug` to help debugging
  * Made `MessageEvent` final
+ * add DSN parameter `verify_peer` to disable TLS peer verification for SMTP transport
 
 4.3.0
 -----
 
@@ -6,6 +6,7 @@
 use Symfony\Component\Mailer\Transport\Dsn;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
 use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransportFactory;
+use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
 use Symfony\Component\Mailer\Transport\TransportFactoryInterface;
 
 class EsmtpTransportFactoryTest extends TransportFactoryTestCase
@@ -67,5 +68,18 @@ public function createProvider(): iterable
             new Dsn('smtps', 'example.com', '', '', 465),
             $transport,
         ];
+
+        $transport = new EsmtpTransport('example.com', 465, true, $eventDispatcher, $logger);
+        /** @var SocketStream $stream */
+        $stream = $transport->getStream();
+        $streamOptions = $stream->getStreamOptions();
+        $streamOptions['ssl']['verify_peer'] = false;
+        $streamOptions['ssl']['verify_peer_name'] = false;
+        $stream->setStreamOptions($streamOptions);
+
+        yield [
+            new Dsn('smtps', 'example.com', '', '', 465, ['verify_peer' => false]),
+            $transport,
+        ];
     }
 }
@@ -13,6 +13,7 @@
 
 use Symfony\Component\Mailer\Transport\AbstractTransportFactory;
 use Symfony\Component\Mailer\Transport\Dsn;
+use Symfony\Component\Mailer\Transport\Smtp\Stream\SocketStream;
 use Symfony\Component\Mailer\Transport\TransportInterface;
 
 /**
@@ -28,6 +29,17 @@ public function create(Dsn $dsn): TransportInterface
 
         $transport = new EsmtpTransport($host, $port, $tls, $this->dispatcher, $this->logger);
 
+        if (!$dsn->getOption('verify_peer', true)) {
+            /** @var SocketStream $stream */
+            $stream = $transport->getStream();
+            $streamOptions = $stream->getStreamOptions();
+
+            $streamOptions['ssl']['verify_peer'] = false;
+            $streamOptions['ssl']['verify_peer_name'] = false;
+
+            $stream->setStreamOptions($streamOptions);
+        }
+
         if ($user = $dsn->getUser()) {
             $transport->setUsername($user);
         }