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.

Generate valid Message-ID in email rejection mailer
a1e1e723 · Warren Guy · 3d61cf9f · a1e1e723
Commit a1e1e723 authored Jan 30, 2016 by Warren Guy
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email_rejection_mailer.rb app/mailers/email_rejection_mailer.rb +1 -1

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--- 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