Code:
 <form name="mail" action="<?php echo $PHP_SELF ?>" method="post">
                      <input name="mailit" value="mailit" type="hidden">
                        <table border="0" cellpadding="4" cellspacing="0">
                          <tbody><tr><td><b>To: </b></td><td><input name="to" size="27" value="[email protected]" readonly="readonly" type="text"></td></tr>
                        <tr><td><b>Name: </b></td><td><input name="name" size="27" type="text"></td></tr>
                        <tr><td><b>Email:</b></td><td><input name="from" size="27" type="text"></td></tr>

                        <tr><td><b>Subject:</b></td><td><input name="subject" size="45" onfocus="clk()" type="text">
                         </td></tr>
                        <tr><td colspan="2"><b>Support Question:</b><br>
                    <textarea name="feedback" rows="10" cols="55" wrap="physical" style="background-color: rgb(221, 221, 221);"></textarea>
                        </td></tr>
                        <tr><td colspan="2" align="right"><input value="Send" type="submit"></td></tr>
                      </tbody></table>

                    </form>
<?php
$_POST['mailit'] = $mailit;
$_POST['to'] = $to;
$_POST['name'] = $name;
$_POST['from'] = $from;
$_POST['subject'] = $subject;
$_POST['feedback'] = $feedback;

if (isset($mailit)) {
        echo "Neki tekst nakon slanja forme";
       mail($to, $subject, $feedback) or die("Ne mogu poslati mail");
           
}

 ?>