Licentie voor DiffMail

SPDX-License-Identifier: GPL-2.0-or-later

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. See <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>.