<style>
.e1 {
  width: 100%;
  padding: 12px 20px;
  margin: 8px 0;
  display: inline-block;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}
</style>
<div>
<form name="contact" action="report.php" method="post" enctype="multipart/form-data" autocomplete="off">
<input class="e1" type="Text" name="name" size="100%" placeholder="ชื่อ+นามสกุล(ผู้ติดต่อ)"/>
<input class="e1" type="hidden" name="destination" value="<?= urlencode($_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']); ?>" />
<input class="e1" type="Text" name="tel" size="100%" placeholder="เบอร์ที่ติดต่อได้"/>
<input class="e1" type="email" name="email" size="100%" placeholder="อีเมล์ที่ติดต่อได้" required/>
<input class="e1" type="Text" name="content" size="100%" placeholder="อื่นๆ" required/>
<div align="center"><input type="Submit" name="submit-board" value="OK" id="validate" class="button-red"/></div>
</form>
</div>

report.php
<meta charset="utf-8">

<?php
if($_POST['submit-board']) {
            $destination=$_POST['destination'];	
            $name=$_POST['name'];	
            $tel=$_POST['tel'];
            $email=$_POST['email'];
            $content=$_POST['content'];
	    $ip = isset($_SERVER['REMOTE_ADDR']) ?
            $_SERVER['REMOTE_ADDR'] : '';				
			
            $to = "i@x.com";
            $subject = "x.com $name"; //1
            $sub="
Contact IP: $ip
<div style='width:100%;
	font-size:14px;
	background-color: aliceblue;
	border: 1px solid;border-color: #bbd8ec;
	padding: 10px;'>

URL : $destination	
<table width='550' border='0' align='center'>			
  <tr><td><b>ผู้ติดต่อ</b></td>		<td><b>$name</b></td></tr>
  <tr><td>เบอร์โทร</td>			<td>$tel</td></tr>
  <tr><td>email</td>			<td>$email </td></tr>
  <tr><td>อื่นๆ</td>		<td>$content</td></tr>
</table>
</div>
";
	 
$bound_text = "jimmyP123";
$bound = "--".$bound_text."\r\n";
$bound_last = "--".$bound_text."--\r\n";

$headers = "From: insurancecthai.net\r\n";
$headers .= "MIME-Version: 1.0\r\n"."Content-Type: multipart/mixed; boundary=\"$bound_text\"";

//1
$message .= "If you can see this MIME than your client doesn't accept MIME types!\r\n"
.$bound;

$message .= "Content-Type: text/html; charset=\"utf-8\"\r\n" 
."Content-Transfer-Encoding: 7bit\r\n\r\n"
."$sub\r\n"
.$bound;

mail($to, $subject, $message, $headers); //1
echo "success";
}
?> 
		 
<script>
window.setTimeout(function() {
window.location = 'https://www.X.com/';
}, 0);
</script>
</div>