From a1e1e72375c6b8f511c779c74b3dd1073afff6c1 Mon Sep 17 00:00:00 2001
From: Warren Guy <warren@guy.net.au>
Date: Sat, 30 Jan 2016 18:30:51 +0800
Subject: Generate valid Message-ID in email rejection mailer

Use a Message-ID that is RFC 2111 compliant. This fix is consistent with
how the Message-ID is generated in the 'notify' mailer.
---
 app/mailers/email_rejection_mailer.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/mailers/email_rejection_mailer.rb b/app/mailers/email_rejection_mailer.rb
index 883f1c73ad4..76db31a4c45 100644
--- a/app/mailers/email_rejection_mailer.rb
+++ b/app/mailers/email_rejection_mailer.rb
@@ -10,7 +10,7 @@ class EmailRejectionMailer < BaseMailer
       subject: "[Rejected] #{@original_message.subject}"
     }
 
-    headers['Message-ID'] = SecureRandom.hex
+    headers['Message-ID'] = "<#{SecureRandom.hex}@#{Gitlab.config.gitlab.host}>"
     headers['In-Reply-To'] = @original_message.message_id
     headers['References'] = @original_message.message_id
 
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