[Minor] Remove one more global

diff --git a/src/plugins/lua/maillist.lua b/src/plugins/lua/maillist.lua
index 1e4c104ded3d3498668dfa4f74aa0bab28ffda9f..eb67a4f12eb105851bee268b9ffffb0d814e67d8 100644 (file)
--- a/src/plugins/lua/maillist.lua
+++ b/src/plugins/lua/maillist.lua
@@ -168,7 +168,7 @@ end
 
 -- RFC 2369 headers
 local function check_rfc2369(task)
-  header = task:get_header('List-Unsubscribe')
+  local header = task:get_header('List-Unsubscribe')
   if not header or not string.find(header, '<.+>') then
     return false
   end