How to change php mail() headers?

Question

PHP

Good day!
How can I remove this from the service header?

Received: from s35.h.mchost.ru ([178.208.83.42]:33404)

Here is the code itself:

if(count($_POST) > 1){
  $from = strval($_POST['from']);
  $to = strval($_POST['to']);
  $subject = strval($_POST['subject']);
  $who = strval($_POST['who']);
  $toes = explode(';', $to);
  $t1 = $toes[0];
  $mess = $_POST['mess'];
  $headers = "MIME-Version: 1.0" . "\r\n";
  $headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
  $headers .= "From: $who <$from>";
  if(count($toes) > 1){
    $to = $toes[0];
    for($i = 1; $i < count($toes); $i++){
      $whe = strval($toes[$i]);
      $to .= ",$whe";
    }
  }
   mail($to, $subject, $mess, $headers, "-fno-$from");
  echo '<script>alert("Sent letter!");</script>';
}

Answer 1

If used, postfixthen you can use this method:
https://major.io/2013/04/14/remove-sensitive-infor...

Answer 2

This header is not added on your side, but by the intermediate servers and the receiving server. Headers can be more than one if there are relays, these headers can be used to restore the path of the letter.
On your side, you cannot remove it.