Traitor/mods/mail_mod/node.lua

minetest.register_node('mail:mailbox', {
   description = 'Mail Box',
   drawtype = 'mesh',
   mesh = 'mail_mailbox.obj',
   tiles = {'mail_mailbox_uv.png'},
   paramtype = 'light',
   paramtype2 = 'facedir',
   sunlight_propagates = true,
   groups = {breakable=1},
   on_rightclick = function(pos, node, clicker)
      local name = clicker:get_player_name()
      local player_attributes = clicker:get_meta()
      local mode = player_attributes:get_string('mode')
      if mode ~= 'traitor' and mode ~= 'player' then
         mail.show_inbox(name)
      else
         minetest.chat_send_player(name, 'You can\'t check your mail now.')
      end
   end
   })