Allow setting server domain for ARC

diff --git a/lualib/lua_dkim_tools.lua b/lualib/lua_dkim_tools.lua
index 5469ac138e243d05880206e99cae14458acac448..15463632b2e215c1764ca99460ede7132fb83eb4 100644 (file)
--- a/lualib/lua_dkim_tools.lua
+++ b/lualib/lua_dkim_tools.lua
@@ -135,6 +135,8 @@ local function prepare_dkim_signing(N, task, settings)
       return udom
     elseif settings[dtype] == 'recipient' then
       return tdom
+    else
+      return settings[dtype]:lower()
     end
   end