function mail_utf8($to, $subject = "(No subject)", $message = "", $header = "")
{
   $header_ = 'MIME-Version: 1.0'."rn".'Content-type: text/plain; charset=UTF-8'."rn";
   $header_ .= "From: my@mail.com"; //Should be optional...
   if (!empty($header)) $header_ .= "rn".$header;
   $out = mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $message, $header_);

   return $out;
}

function mail_utf8($to, $subject = "(No subject)", $message = "", $header = "")
{
$linebreak = PHP_EOL; //Seems to work everywhere, including IncrediMail
$linebreak = "n"; //Debug
$header_ = 'MIME-Version: 1.0'.$linebreak.'Content-type: text/plain; charset=UTF-8'.$linebreak;
$header_ .= "From: my@mail.com".$linebreak;
if (!empty($header)) $header_ .= $header.$linebreak; //Last line break !?
$out = mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $message, $header_);

return $out;
}

function mail_utf8($to, $subject = "(No subject)", $message = "", $header = "") {
    $header_  = "MIME-Version: 1.0rnContent-type: text/plain; charset=UTF-8rn";
    $header_ .= "From: my@mail.comrn";
    if(!empty($header)) $header_ .= $header;
    $out = mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $message, $header_);
    return $out;
  }