From b684d40f0ffbc21ae75fe15cd7c66b7bafcbe380 Mon Sep 17 00:00:00 2001
From: Pavel Popov <pavelpopovw@gmail.com>
Date: Fri, 20 Aug 2021 13:35:51 +0300
Subject: [PATCH] Ignoring X-Transport header while signing email with DKIM

---
 src/Symfony/Component/Mime/Crypto/DkimSigner.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Symfony/Component/Mime/Crypto/DkimSigner.php b/src/Symfony/Component/Mime/Crypto/DkimSigner.php
index 3d046b8d9461d..dfb6f226b5e51 100644
--- a/src/Symfony/Component/Mime/Crypto/DkimSigner.php
+++ b/src/Symfony/Component/Mime/Crypto/DkimSigner.php
@@ -68,6 +68,7 @@ public function sign(Message $message, array $options = []): Message
             throw new InvalidArgumentException('Invalid DKIM signing algorithm "%s".', $options['algorithm']);
         }
         $headersToIgnore['return-path'] = true;
+        $headersToIgnore['x-transport'] = true;
         foreach ($options['headers_to_ignore'] as $name) {
             $headersToIgnore[strtolower($name)] = true;
         }