diff --git a/src/Symfony/Component/Mailer/Tests/Transport/RoundRobinTransportTest.php b/src/Symfony/Component/Mailer/Tests/Transport/RoundRobinTransportTest.php
index a1b2befcce846..cc5656e1e9a56 100644
--- a/src/Symfony/Component/Mailer/Tests/Transport/RoundRobinTransportTest.php
+++ b/src/Symfony/Component/Mailer/Tests/Transport/RoundRobinTransportTest.php
@@ -16,6 +16,8 @@
use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
use Symfony\Component\Mailer\Transport\RoundRobinTransport;
use Symfony\Component\Mailer\Transport\TransportInterface;
+use Symfony\Component\Mime\Header\Headers;
+use Symfony\Component\Mime\Message;
use Symfony\Component\Mime\RawMessage;
/**
@@ -143,6 +145,27 @@ public function testSendOneDeadAndRecoveryWithinRetryPeriod()
$this->assertTransports($t, 1, []);
}
+ public function testSendOneDeadMessageAlterationsDoNotPersist()
+ {
+ $t1 = $this->createMock(TransportInterface::class);
+ $t1->expects($this->once())->method('send')
+ ->willReturnCallback(function (Message $message) {
+ $message->getHeaders()->addTextHeader('X-Transport-1', 'value');
+ throw new TransportException();
+ });
+ $t2 = $this->createMock(TransportInterface::class);
+ $t2->expects($this->once())->method('send');
+ $t = new RoundRobinTransport([$t1, $t2]);
+ $p = new \ReflectionProperty($t, 'cursor');
+ $p->setValue($t, 0);
+ $headers = new Headers();
+ $headers->addTextHeader('X-Shared', 'value');
+ $message = new Message($headers);
+ $t->send($message);
+ $this->assertSame($message->getHeaders()->get('X-Shared')->getBody(), 'value');
+ $this->assertFalse($message->getHeaders()->has('X-Transport-1'));
+ }
+
public function testFailureDebugInformation()
{
$t1 = $this->createMock(TransportInterface::class);
diff --git a/src/Symfony/Component/Mailer/Transport/RoundRobinTransport.php b/src/Symfony/Component/Mailer/Transport/RoundRobinTransport.php
index ac9709bf7b6c4..a88662d623ef9 100644
--- a/src/Symfony/Component/Mailer/Transport/RoundRobinTransport.php
+++ b/src/Symfony/Component/Mailer/Transport/RoundRobinTransport.php
@@ -52,7 +52,7 @@ public function send(RawMessage $message, ?Envelope $envelope = null): ?SentMess
while ($transport = $this->getNextTransport()) {
try {
- return $transport->send($message, $envelope);
+ return $transport->send(clone $message, $envelope);
} catch (TransportExceptionInterface $e) {
$exception ??= new TransportException('All transports failed.');
$exception->appendDebug(sprintf("Transport \"%s\": %s\n", $transport, $e->getDebug()));
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