$headers = 'MIME-Version: 1.0' . "n";
$headers .= "Content-type: text/html; charset=utf-8" . "n";
$headers .= "Return-Path: <adminemail@yahoo.com>"."n";
$headers .= "Errors-To: <adminemail@yahoo.com>"."n";
// Additional headers
$headers .= "To: email1@yahoo.com <adminemail@yahoo.com>" . "n";
$headers .= "From: adminemail@yahoo.com <adminemail@yahoo.com>" . "n";
// Mail it
mail('email1@yahoo.com', 'test', 'salam', $headers, "f");

$headers = 'From: webmaster@example.com' . 'rn' .
'Reply-To: webmaster@example.com’ . 'rn' .
'Return-Path: webmaster@example.com’ . 'rn' .

mail($to, $subject, $message, $headers, "-femail@wherever.com");

$headers = "MIME-Version: 1.0rn".
   "Content-type: text/html; charset=utf-8rn".
   "Return-Path: adminemail@yahoo.comrn";
mail ("email1@yahoo.com","test","salam",$headers,"f");

$headers = '';
$headers .= "Reply-To: " . 'yourname@mydomain.com' . "n";

mail('test@somedomain.com', 'Subject: test', 'this is a test', $headers);