Hi Mikawhat,
Use the following script, it will allow you to use HTML tags in the body of your email sent via PHP.
// Read POST request params into global vars
$to = $_POST['clientemail'];
$from = $_POST['youremail'];
$name = $_POST['clientname'];
$subject = $_POST['subject'];
$headers = "From: Your Name";
$headers .= "<$from>\r\n";
$headers .= "Reply-To: $from";
$headers .= "MIME-Version: 1.0\n";
$headers .= "Content-type: text/html;charset=ISO-8859-9\n";
$headers .= "Importance: High\n";
mail("$to", "$subject", "Hi $name,<br><br>This is the body of my email.<br><br>Thanks for contacting us.<br><i>Someone will get in touch with you shortly.", $headers);