Copyright for postgrey source package in Buster

This Debian package was prepared by Adrian von Bidder  in
July 2004, then the package was adopted by Antonio Radici 
in Sept 2009

It was downloaded from http://postgrey.schweikert.ch/

Upstream Author: David Schweikert 
                 postgreyreport by tbaker@bakerfl.org

Copyright: postgrey is copyright © 2004-2006 ETH Zürich
                                 © 2007 Open Systems AG, Switzerland
           postgreyreport is copyright © 2004 tbaker@bakerfl.org

License:

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  On Debian systems, the complete text of the GNU General
  Public License can be found in `/usr/share/common-licenses/GPL-2'.