Every time I send out a message, however small, it is returned 'Error - too big for receivers system' and returns it showing attached the original short message AND a .dat attachment - always ATT (and number) . It is THIS that is too big for the receiver. I do not put it there -. HOW do I get rid of it please?  This has only started about 3 - 4 weeks ago.The one person I know that does receive successfully, my wife, is on Outlook. I have read about Winmail and the problems with Rich text as compare with HMLT and guidance to Outlook users to control this - but I cannot see anywhere ho