Send mail in HTML FORMAT

I read from a template, insert data and save it as a new file with html code... i want to send that file that is the same as $out via mail embedded in it... i do $fifi = fopen ('/'.$cursada.$cuatrimestre.'/'.$registronro.'.htm', "w"); $fp = $fifi; fputs ($fifi, $out . ""); fclose ($fifi); mail("mymail@justtoknow.com", "subject",$out , "From: website"); but when i receive that mail.. i get the source of the file with <html> <body> bla bla bla.... not in HTML FORMAT.. thnx in advance!.. Spooky