Try something like this:
<?php
$headers = "From:your@email.com\n";
$headers .= "Content-type:text/html";
$message = "<body>";
$message .= "<font face=\"verdana\" color=\"#ff6600\">";
$message .= "Just a test!";
$message .= "</font></body>";
$subject = "Just at HTML e-mail!";
$to = "email@email.com";
mail($to, $subject, $message, $headers);
echo "E-mail send to $to";
?>
Play with this script, I should send a HTML formatted e-mail :o)
regards,
Johan
