From d6ffe08aebff4a29cfea865cdea647d3d2e83ef1 Mon Sep 17 00:00:00 2001
From: Frédéric Guillot <fred@kanboard.net>
Date: Sat, 27 Apr 2019 20:33:53 -0700
Subject: Add Auto-Submitted E-mail header as per RFC 8384

---
 app/Core/Mail/Transport/Mail.php | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'app')

diff --git a/app/Core/Mail/Transport/Mail.php b/app/Core/Mail/Transport/Mail.php
index 0d819f77..0fc278d1 100644
--- a/app/Core/Mail/Transport/Mail.php
+++ b/app/Core/Mail/Transport/Mail.php
@@ -36,6 +36,11 @@ class Mail extends Base implements ClientInterface
                 ->setFrom($this->helper->mail->getMailSenderAddress(), $authorName)
                 ->setTo(array($recipientEmail => $recipientName));
 
+            $headers = $message->getHeaders();
+
+            // See https://tools.ietf.org/html/rfc3834#section-5
+            $headers->addTextHeader('Auto-Submitted', 'auto-generated');
+
             if (! empty($authorEmail)) {
                 $message->setReplyTo($authorEmail);
             }
-- 
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