[Mailer] include message id provided by the MTA when dispatching the SentMessageEvent

src/Symfony/Component/Mailer/Tests/Transport/Smtp/DummyStream.php

@@ -77,7 +77,7 @@ public function write(string $bytes, $debug = true): void
         } elseif (str_starts_with($bytes, 'QUIT')) {
             $this->nextResponse = '221 Goodbye';
         } else {
-            $this->nextResponse = '250 OK';
+            $this->nextResponse = '250 OK queued as 000501c4054c';
         }
     }
 

src/Symfony/Component/Mailer/Tests/Transport/Smtp/SmtpTransportTest.php

@@ -13,6 +13,8 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Mailer\Envelope;
+use Symfony\Component\Mailer\Event\MessageEvent;
+use Symfony\Component\Mailer\Event\SentMessageEvent;
 use Symfony\Component\Mailer\Exception\LogicException;
 use Symfony\Component\Mailer\Exception\TransportException;
 use Symfony\Component\Mailer\Transport\Smtp\SmtpTransport;
@@ -24,6 +26,7 @@
 use Symfony\Component\Mime\Part\DataPart;
 use Symfony\Component\Mime\Part\File;
 use Symfony\Component\Mime\RawMessage;
+use Symfony\Contracts\EventDispatcher\EventDispatcherInterface;
 
 /**
  * @group time-sensitive
@@ -137,6 +140,37 @@ public function testWriteEncodedRecipientAndSenderAddresses()
         $this->assertContains("RCPT TO:<recipient2@example.org>\r\n", $stream->getCommands());
     }
 
+    public function testMessageIdFromServerIsEmbeddedInSentMessageEvent()
+    {
+        $calls = 0;
+        $eventDispatcher = $this->createMock(EventDispatcherInterface::class);
+        $eventDispatcher->expects($this->any())
+            ->method('dispatch')
+            ->with($this->callback(static function ($event) use (&$calls): bool {
+                ++$calls;
+
+                if (1 === $calls && $event instanceof MessageEvent) {
+                    return true;
+                }
+
+                if (2 === $calls && $event instanceof SentMessageEvent && '000501c4054c' === $event->getMessage()->getMessageId()) {
+                    return true;
+                }
+
+                return false;
+            }));
+        $transport = new SmtpTransport(new DummyStream(), $eventDispatcher);
+
+        $email = new Email();
+        $email->from('sender@example.com');
+        $email->to('recipient@example.com');
+        $email->text('.');
+
+        $transport->send($email);
+
+        $this->assertSame(2, $calls);
+    }
+
     public function testAssertResponseCodeNoCodes()
     {
         $this->expectException(LogicException::class);

src/Symfony/Component/Mailer/Transport/Smtp/SmtpTransport.php

@@ -39,7 +39,6 @@ class SmtpTransport extends AbstractTransport
     private int $pingThreshold = 100;
     private float $lastMessageTime = 0;
     private AbstractStream $stream;
-    private string $mtaResult = '';
     private string $domain = '[127.0.0.1]';
 
     public function __construct(?AbstractStream $stream = null, ?EventDispatcherInterface $dispatcher = null, ?LoggerInterface $logger = null)
@@ -148,10 +147,6 @@ public function send(RawMessage $message, ?Envelope $envelope = null): ?SentMess
             throw $e;
         }
 
-        if ($this->mtaResult && $messageId = $this->parseMessageId($this->mtaResult)) {
-            $message->setMessageId($messageId);
-        }
-
         $this->checkRestartThreshold();
 
         return $message;
@@ -235,9 +230,13 @@ protected function doSend(SentMessage $message): void
                 $this->getLogger()->debug(sprintf('Email transport "%s" stopped', __CLASS__));
                 throw $e;
             }
-            $this->mtaResult = $this->executeCommand("\r\n.\r\n", [250]);
+            $mtaResult = $this->executeCommand("\r\n.\r\n", [250]);
             $message->appendDebug($this->stream->getDebug());
             $this->lastMessageTime = microtime(true);
+
+            if ($mtaResult && $messageId = $this->parseMessageId($mtaResult)) {
+                $message->setMessageId($messageId);
+            }
         } catch (TransportExceptionInterface $e) {
             $e->appendDebug($this->stream->getDebug());
             $this->lastMessageTime = 0;