Perhaps it's better to use PHPMailer (http://phpmailer.worxware.com/index.php)
See te example @ http://phpmailer.worxware.com/index.php?pg=examplebmail
require_once('../class.phpmailer.php');
$mail             = new PHPMailer(); // defaults to using php "mail()"
$body             = file_get_contents('contents.html');
$body             = eregi_replace("[\]",'',$body);
$mail->AddReplyTo("[email protected]","First Last");
$mail->SetFrom('[email protected]', 'First Last');
$mail->AddReplyTo("[email protected]","First Last");
$address = "[email protected]";
$mail->AddAddress($address, "John Doe");
$mail->Subject    = "PHPMailer Test Subject via mail(), basic";
$mail->AltBody    = "To view the message, please use an HTML compatible email viewer!"; // optional, comment out and test
$mail->MsgHTML($body);
$mail->AddAttachment("images/phpmailer.gif");      // attachment
$mail->AddAttachment("images/phpmailer_mini.gif"); // attachment
if(!$mail->Send()) {
  echo "Mailer Error: " . $mail->ErrorInfo;
} else {
  echo "Message sent!";
}
In this part:
$mail->SetFrom('[email protected]', 'First Last');
you can set te name and email for the from adress.