Bug 496439 - in-message reply-menu should not include "reply list" when List-Post: value is NO, r=philringnalda

mail/base/content/mailWindowOverlay.js

@@ -893,8 +893,18 @@ function IsReplyAllEnabled()
  */
 function IsReplyListEnabled()
 {
-  // ReplyToList is enabled if there is a List-Post header.
-  return currentHeaderData["list-post"] != null;
+  // ReplyToList is enabled if there is a List-Post header
+  // with the correct format.
+  let listPost = currentHeaderData["list-post"];
+  if (listPost)
+  {
+    // XXX: Once Bug 496914 provides a parser, we should use that instead.
+    // Until then, we need to keep the following regex in sync with the
+    // listPost parsing in nsMsgCompose.cpp's
+    // QuotingOutputStreamListener::OnStopRequest.
+    return /^<mailto:.*>$/.test(listPost['headerValue']);
+  }
+  return false;
 }
 
 /**