$ grep "8bit" * 
email_attach.php:header("Content-Transfer-Encoding: 8bit");
email_attach.php:    header("Content-Transfer-Encoding: 8bit");
email_functions.php:    $encodings = array(ENC7BIT => '7bit', ENC8BIT => '8bit', ENCBINARY => 'binary', ENCBASE64 => 'base64', 
email_neu.php:  /* This ContentTypes should not be encoded with base64 - use the given encode-Type e.g. "8bit" */
email_neu.php:  $encodeType["text/plain"] = "8bit";
email_neu.php:  $encodeType["text/html"] = "8bit";
email_neu.php:  $encodeType["message/rfc822"] = "8bit";
email_neu.php:  $encodeType["message/external-body"] = "8bit";
email_neu.php:  $encodeType["message/http"] = "8bit";
email_neu.php:  $encodeType["message/news"] = "8bit";
email_neu.php:  $encodeType["message/partial"] = "8bit";
email_neu.php:      $mail_header .= "\nContent-Transfer-Encoding: 8bit";
email_neu.php:      $mail_header .= "\nContent-Transfer-Encoding: 8bit";