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diff --git a/src/mailman_pgp/archivers/local_maildir.py b/src/mailman_pgp/archivers/local_maildir.py
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+++ b/src/mailman_pgp/archivers/local_maildir.py
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+# Copyright (C) 2017 Jan Jancar
+#
+# This file is a part of the Mailman PGP plugin.
+#
+# 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 3 of the License, or (at your option)
+# any later version.
+#
+# This program 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
+# this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Archives messages to a maildir, locally, encrypted (TBD how),
+similar to Mailman's prototype archiver.
+"""
+import os
+from mailbox import Maildir
+
+from flufl.lock import Lock
+from mailman.interfaces.archiver import IArchiver
+from public import public
+from zope.interface import implementer
+
+from mailman_pgp.config import config, mm_config
+from mailman_pgp.model.list import PGPMailingList
+from mailman_pgp.pgp.mime import MIMEWrapper
+
+
+@public
+@implementer(IArchiver)
+class LocalMaildirArchiver:
+    """Local PGP enabled archiver."""
+
+    name = 'pgp-maildir-local'
+    is_enabled = False
+
+    @staticmethod
+    def list_url(mlist):
+        """See `IArchiver`."""
+        return None
+
+    @staticmethod
+    def permalink(mlist, msg):
+        """See `IArchiver`."""
+        return None
+
+    @staticmethod
+    def archive_message(mlist, msg):
+        """See `IArchiver`."""
+        pgp_list = PGPMailingList.for_list(mlist)
+        if not pgp_list:
+            return None
+        maildir_dir = config.get_value('archiving', 'maildir_dir')
+        maildir_dir.mkdir(parents=True, exist_ok=True)
+
+        list_dir = maildir_dir.joinpath(mlist.fqdn_listname)
+        maildir = Maildir(str(list_dir))
+        lock_file = os.path.join(mm_config.LOCK_DIR,
+                                 '{}-{}.lock'.format(mlist.fqdn_listname,
+                                                     LocalMaildirArchiver.name)
+                                 )
+        wrapped = MIMEWrapper(msg)
+        encrypted = wrapped.encrypt(pgp_list.pubkey)
+        with Lock(lock_file):
+            maildir.add(encrypted)
+        return None