symfony
diff --git a/‎src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php
+3-3Lines changed: 3 additions & 3 deletions b/‎src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Bridge/Mailgun/Tests/Transport/MailgunApiTransportTest.php
+3-3Lines changed: 3 additions & 3 deletions
diff --git a/‎src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php
+1-1Lines changed: 1 addition & 1 deletion b/‎src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/Mailer/Bridge/Mailgun/Transport/MailgunApiTransport.php
+1-1Lines changed: 1 addition & 1 deletion
@@ -62,7 +62,7 @@ public function testCustomHeader()
 
         $email = new Email();
         $envelope = new Envelope(new Address('alice@system.com'), [new Address('bob@system.com')]);
-        $email->getHeaders()->addTextHeader('h:sender', $envelope->getSender()->toString());
+        $email->getHeaders()->addTextHeader('h:Sender', $envelope->getSender()->toString());
         $email->getHeaders()->addTextHeader('h:X-Mailgun-Variables', $json);
         $email->getHeaders()->addTextHeader('h:foo', 'foo-value');
         $email->getHeaders()->addTextHeader('t:text', 'text-value');
@@ -79,8 +79,8 @@ public function testCustomHeader()
         $this->assertArrayHasKey('h:X-Mailgun-Variables', $payload);
         $this->assertEquals($json, $payload['h:X-Mailgun-Variables']);
 
-        $this->assertArrayHasKey('h:sender', $payload);
-        $this->assertEquals($envelope->getSender()->toString(), $payload['h:sender']);
+        $this->assertArrayHasKey('h:Sender', $payload);
+        $this->assertEquals($envelope->getSender()->toString(), $payload['h:Sender']);
         $this->assertArrayHasKey('h:foo', $payload);
         $this->assertEquals('foo-value', $payload['h:foo']);
         $this->assertArrayHasKey('t:text', $payload);
 
@@ -87,7 +87,7 @@ protected function doSendApi(SentMessage $sentMessage, Email $email, Envelope $e
     private function getPayload(Email $email, Envelope $envelope): array
     {
         $headers = $email->getHeaders();
-        $headers->addHeader('h:sender', $envelope->getSender()->toString());
+        $headers->addHeader('h:Sender', $envelope->getSender()->toString());
         $html = $email->getHtmlBody();
         if (null !== $html && \is_resource($html)) {
             if (stream_get_meta_data($html)['seekable'] ?? false) {