[Mailer] fix encoding of addresses using SmtpTransport

Author: dmaicher

Tests/Transport/Smtp/SmtpTransportTest.php

@@ -114,6 +114,25 @@ public function testSendInvalidMessage()
         $this->assertNotContains("\r\n.\r\n", $stream->getCommands());
         $this->assertTrue($stream->isClosed());
     }
+
+    public function testWriteEncodedRecipientAndSenderAddresses()
+    {
+        $stream = new DummyStream();
+
+        $transport = new SmtpTransport($stream);
+
+        $message = new Email();
+        $message->from('sender@exämple.org');
+        $message->addTo('recipient@exämple.org');
+        $message->addTo('recipient2@example.org');
+        $message->text('.');
+
+        $transport->send($message);
+
+        $this->assertContains("MAIL FROM:<sender@xn--exmple-cua.org>\r\n", $stream->getCommands());
+        $this->assertContains("RCPT TO:<recipient@xn--exmple-cua.org>\r\n", $stream->getCommands());
+        $this->assertContains("RCPT TO:<recipient2@example.org>\r\n", $stream->getCommands());
+    }
 }
 
 class DummyStream extends AbstractStream

Transport/Smtp/SmtpTransport.php

@@ -194,9 +194,9 @@ protected function doSend(SentMessage $message): void
 
         try {
             $envelope = $message->getEnvelope();
-            $this->doMailFromCommand($envelope->getSender()->getAddress());
+            $this->doMailFromCommand($envelope->getSender()->getEncodedAddress());
             foreach ($envelope->getRecipients() as $recipient) {
-                $this->doRcptToCommand($recipient->getAddress());
+                $this->doRcptToCommand($recipient->getEncodedAddress());
             }
 
             $this->executeCommand("DATA\r\n", [354]);