Sending HTML email through PHP

We can use mail function of PHP to send emails. For sending HTML email we've to set some headers.

Here is the syntax..

    $from="test@test.com";
    $to="test@test.com";
    $subject="your subject";



    $headers  = 'MIME-Version: 1.0' . "\r\n";
    $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";    

    $headers .= "From: ".$from."\r\n";
    $headers .= "Reply-To: ".$from."\r\n";
    $headers .= "Return-Path: ".$from."\r\n";



   if (mail($to,$subject,$message,$headers) )
   {
   echo 'Successfully sent'; 

    } else {

       echo "Email address is not valid";

    }