try this if you're using Net::SMTP :

$mail->data(); 
$mail->datasend("To: you@you.com"); 
$mail->datasend("From: me@me.com\n"); 
$mail->datasend("Subject: Subject Text\n"); 
$mail->datasend("\n"); 
$mail->datasend("Email content\n\n"); 
$mail->dataend();
[download]

for sending HTML , set the Content-type of the mail object to "text/html" hth