Edit:  manager\includes\controls\class.phpmailer.php

Comment line 438:

// $rt = @mail($to, $this->EncodeHeader($this->Subject), $body, $header);

And add this:

{
       $headers = 'From: [email protected]' . "
" .
         'Reply-To: [email protected]' . "
" .
         'X-Mailer: PHP/' . phpversion() . "
" .
         'MIME-Version: 1.0' . "
" .
         'Content-Transfer-Encoding: 8bit' . "
" .
         'Content-Type: text/html; charset="UTF-8"';
       $rt = @mail($to, $this->EncodeHeader($this->Subject), $body, $headers);
    }

Fix Mailing Problem

PHP