sendmail in html

[Rahul Garg]

hi,
well i am  trying to send mails thru sendmail in html but they are coming in html with 
tags and html not getting executed.
how should i correct the prob.

open (MAIL, "|$mail_prog -t"); 
print MAIL "To: $r_mailid \n" ;
 print MAIL "From: $s_mailid \n" ;
 print MAIL "Subject: $subject \n\n" ;

 print MAIL "Content-type: text/html\n\n";

     
 print MAIL "$c_message" ;#####data  in html
print MAIL "\n\n" ;
 
 close (MAIL) ;