Php email only english well - greek chars other shown not understandable

PHP
1

In PHP email only English chars seem well - Greek chars or other shown not understandable
also name of attachment follows the same not valid chars if in Greek or other…

how fix this?

ob_start();
include('applyprocessorConfirm4.php');
$message2 = ob_get_clean();

$headers = "From:info@fff.org";
$headers .= "\\r\
Bcc:info_1@fff.org";
$headers .= "\\r\
Reply-To:{$email}";

if (is_uploaded_file($fileatt)) {
  // Read the file to be attached ('rb' = read binary)
  $file = fopen($fileatt,'rb');
  $data = fread($file,filesize($fileatt));
  fclose($file);

  // Generate a boundary string
  $semi_rand = md5(time());
  $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";

  // Add the headers for a file attachment
  $headers .= "\\r\
MIME-Version: 1.0\
" .
              "Content-Type: multipart/mixed;\
" .
              " boundary=\\"{$mime_boundary}\\"";

  // Add a multipart boundary above the plain message
  $message = "This is a multi-part message in MIME format.\
\
" .
             "--{$mime_boundary}\
" .
             "Content-Type: text/html; charset=\\"iso-8859-1\\"\
" .
             "Content-Transfer-Encoding: 7bit\
\
" .
             $message2 . "\
\
";

  // Base64 encode the file data
  $data = chunk_split(base64_encode($data));

  // Add file attachment to the message
  $message .= "--{$mime_boundary}\
" .
              "Content-Type: {$fileatt_type};\
" .
              " name=\\"{$fileatt_name}\\"\
" .
              //"Content-Disposition: attachment;\
" .
              //" filename=\\"{$fileatt_name}\\"\
" .
              "Content-Transfer-Encoding: base64\
\
" .
              $data . "\
\
" .
              "--{$mime_boundary}--\
";
} else {
  $headers .= "\\r\
Content-Type: text/html; charset=UTF-8";
  $headers .= "\\r\
MIME-Version: 1.0";
  $message = $message2;
}

if ($msgErr=='')
mail($to,$subject,$message,$headers);
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