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diff --git a/src/mailman/pipeline/acknowledge.py b/src/mailman/pipeline/acknowledge.py
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+++ b/src/mailman/pipeline/acknowledge.py
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+# Copyright (C) 1998-2009 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/>.
+
+"""Send an acknowledgment of the successful post to the sender.
+
+This only happens if the sender has set their AcknowledgePosts attribute.
+"""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'Acknowledge',
+    ]
+
+
+from zope.interface import implements
+
+from mailman import Message
+from mailman import Utils
+from mailman.i18n import _
+from mailman.interfaces.handler import IHandler
+
+
+
+class Acknowledge:
+    """Send an acknowledgment."""
+    implements(IHandler)
+
+    name = 'acknowledge'
+    description = _("""Send an acknowledgment of a posting.""")
+
+    def process(self, mlist, msg, msgdata):
+        """See `IHandler`."""
+        # Extract the sender's address and find them in the user database
+        sender = msgdata.get('original_sender', msg.get_sender())
+        member = mlist.members.get_member(sender)
+        if member is None or not member.acknowledge_posts:
+            # Either the sender is not a member, in which case we can't know
+            # whether they want an acknowlegment or not, or they are a member
+            # who definitely does not want an acknowlegment.
+            return
+        # Okay, they are a member that wants an acknowledgment of their post.
+        # Give them their original subject.  BAW: do we want to use the
+        # decoded header?
+        original_subject = msgdata.get(
+            'origsubj', msg.get('subject', _('(no subject)')))
+        # Get the user's preferred language.
+        lang = msgdata.get('lang', member.preferred_language)
+        # Now get the acknowledgement template.
+        realname = mlist.real_name
+        text = Utils.maketext(
+            'postack.txt',
+            {'subject'     : Utils.oneline(original_subject,
+                                           Utils.GetCharSet(lang)),
+             'listname'    : realname,
+             'listinfo_url': mlist.script_url('listinfo'),
+             'optionsurl'  : member.options_url,
+             }, lang=lang, mlist=mlist, raw=True)
+        # Craft the outgoing message, with all headers and attributes
+        # necessary for general delivery.  Then enqueue it to the outgoing
+        # queue.
+        subject = _('$realname post acknowledgment')
+        usermsg = Message.UserNotification(sender, mlist.bounces_address,
+                                           subject, text, lang)
+        usermsg.send(mlist)