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diff --git a/Mailman/interfaces/preferences.py b/Mailman/interfaces/preferences.py
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+# Copyright (C) 2007 by the Free Software Foundation, Inc.
+#
+# 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.
+#
+# 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, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+# USA.
+
+"""Interface for preferences."""
+
+from zope.interface import Interface, Attribute
+
+
+
+class IPreferences(Interface):
+    """Delivery related information."""
+
+    acknowledge_posts = Attribute(
+        """Send an acknowledgment for every posting?
+
+        This preference can be True, False, or None.  True means the user is
+        sent a receipt for each message they send to the mailing list.  False
+        means that no receipt is sent.  None means no preference is
+        specified.""")
+
+    preferred_language = Attribute(
+        """The preferred language for interacting with a mailing list.
+
+        This is either the language code for the preferred language, or None
+        meaning no preferred language is specified.""")
+
+    receive_list_copy = Attribute(
+        """Should an explicit recipient receive a list copy?
+
+        When a list member is explicitly named in a message's recipients
+        (e.g. the To or CC headers), and this preference is True, the
+        recipient will still receive a list copy of the message.  When False,
+        this list copy will be suppressed.  None means no preference is
+        specified.""")
+
+    receive_own_postings = Attribute(
+        """Should the poster get a list copy of their own messages?
+
+        When this preference is True, a list copy will be sent to the poster
+        of all messages.  When False, this list copy will be suppressed.  None
+        means no preference is specified.""")
+
+    delivery_mode = Attribute(
+        """The preferred delivery mode.
+
+        This is an enum constant of the type DeliveryMode.  It may also be
+        None which means that no preference is specified.""")