<?php

$act = $_GET['act'];  // get act from URL

switch ($act) {
  case default:
    // this case is for showing form
?>
    <form action="mymail.php?act=process" method="post">
     Subject: <input type="text" name="subject" size="75" /><br />
     From: <input type="text" name="from" value="your@email.com" />
     To: <br />
     <textarea name="to" cols="55" rows="5"></textarea>
     Message: <br />
     <textarea name="message" cols="55" rows="10"></textarea><br />
    <input type="submit" value="Send!" />
    </form>
<?php
    
  break;

  case 'process':
     $subject = $_POST['subject'];
     $from = $_POST['from'];
     $to = $_POST['to'];
     $message = $_POST['message'];

     // check all the fields first
     if (empty($subject) || empty($from) || empty($to) || empty($message))
        exit('Error: You didnt fill all the field.);
     else {
           // split the address separate by ";"
       $addr = explode(";", $to);   // $addr now array
       // loop to send the email to all address
       foreach ($addr as $address) {
             // new code
             print "Sending mail to $address..."
             sleep(1);   // sleep execution for 1 second
         if (mail($address, $subject, $message, $from))
               print "done!<br />";
             else
               print "failed!<br />";

               flush();   // force the browser to print the output, even the HTML is incomplete
        }
            print "Finished processing ".count($addr)." address";
     }
  break;
}
?>