From 834b83aaeadb7f258fd690bce7ab2867272e9204 Mon Sep 17 00:00:00 2001
From: Jeff Atwood <jatwood@discourse.org>
Date: Sat, 14 Jun 2014 00:13:08 -0700
Subject: [PATCH] use a variable to set the header

---
 lib/email/sender.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/email/sender.rb b/lib/email/sender.rb
index 1808387224e..03805a7d014 100644
--- a/lib/email/sender.rb
+++ b/lib/email/sender.rb
@@ -70,7 +70,8 @@ module Email
         @message.header['References'] = topic_identifier
 
         # http://www.ietf.org/rfc/rfc2919.txt
-        @message.header['List-ID'] = "<topic.#{topic_id}.#{host}>"
+        list_id = "<topic.#{topic_id}.#{host}>"
+        @message.header['List-ID'] = list_id
         # can't figure out how to get the current URL of the topic here
         #@message.header['List-Archive'] =
       end