diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/ProcessStream.php b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/ProcessStream.php
index a8a8603807d27..bc721ad0cd85f 100644
--- a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/ProcessStream.php
+++ b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/ProcessStream.php
@@ -35,7 +35,7 @@ public function initialize(): void
$descriptorSpec = [
0 => ['pipe', 'r'],
1 => ['pipe', 'w'],
- 2 => ['pipe', 'w'],
+ 2 => ['pipe', '\\' === \DIRECTORY_SEPARATOR ? 'a' : 'w'],
];
$pipes = [];
$this->stream = proc_open($this->command, $descriptorSpec, $pipes);
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