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# Copyright (C) 2001-2016 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman 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 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.

"""Creation/deletion hooks for the MTAs that do things automatically.

Exim one example of an MTA that Just Works.
"""

from mailman.interfaces.mta import IMailTransportAgentLifecycle
from public import public
from zope.interface import implementer


@public
@implementer(IMailTransportAgentLifecycle)
class NullMTA:
    """Null MTA that just satisfies the interface."""

    def create(self, mlist):
        """See `IMailTransportAgentLifecycle`."""
        pass

    def delete(self, mlist):
        """See `IMailTransportAgentLifecycle`."""
        pass

    def regenerate(self, output=None):
        """See `IMailTransportAgentLifecycle`."""
        pass