bug symfony#44092 [Mime] Provide the right flags to IDN methods for e…

…mail addresses conversion

src/Symfony/Component/Mime/Encoder/IdnAddressEncoder.php

@@ -43,7 +43,7 @@ public function encodeString(string $address): string
             }
 
             if (preg_match('/[^\x00-\x7F]/', $domain)) {
-                $address = sprintf('%s@%s', $local, idn_to_ascii($domain, 0, \INTL_IDNA_VARIANT_UTS46));
+                $address = sprintf('%s@%s', $local, idn_to_ascii($domain, \IDNA_DEFAULT | \IDNA_USE_STD3_RULES | \IDNA_CHECK_BIDI | \IDNA_CHECK_CONTEXTJ | \IDNA_NONTRANSITIONAL_TO_ASCII, \INTL_IDNA_VARIANT_UTS46));
             }
         }
 

src/Symfony/Component/Mime/Tests/Encoder/IdnAddressEncoderTest.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Symfony\Component\Mime\Encoder;
+
+use PHPUnit\Framework\TestCase;
+
+class IdnAddressEncoderTest extends TestCase
+{
+    public function testEncodeString()
+    {
+        $this->assertEquals('test@xn--fuball-cta.test', (new IdnAddressEncoder())->encodeString('test@fußball.test'));
+    }
+}