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diff --git a/Mailman/Handlers/Acknowledge.py b/Mailman/Handlers/Acknowledge.py
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+++ b/Mailman/Handlers/Acknowledge.py
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+# Copyright (C) 1998,1999,2000,2001,2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+"""Send an acknowledgement of the successful post to the sender.
+
+This only happens if the sender has set their AcknowledgePosts attribute.
+This module must appear after the deliverer in the message pipeline in order
+to send acks only after successful delivery.
+
+"""
+
+from Mailman import mm_cfg
+from Mailman import Utils
+from Mailman import Message
+from Mailman import Errors
+from Mailman.i18n import _
+
+
+
+def process(mlist, msg, msgdata):
+    # Extract the sender's address and find them in the user database
+    sender = msgdata.get('original_sender', msg.get_sender())
+    try:
+        ack = mlist.getMemberOption(sender, mm_cfg.AcknowledgePosts)
+        if not ack:
+            return
+    except Errors.NotAMemberError:
+        return
+    # Okay, they want acknowledgement of their post.  Give them their original
+    # subject.  BAW: do we want to use the decoded header?
+    origsubj = msgdata.get('origsubj', msg.get('subject', _('(no subject)')))
+    # Get the user's preferred language
+    lang = msgdata.get('lang', mlist.getMemberLanguage(sender))
+    # Now get the acknowledgement template
+    realname = mlist.real_name
+    text = Utils.maketext(
+        'postack.txt',
+        {'subject'     : origsubj,
+         'listname'    : realname,
+         'listinfo_url': mlist.GetScriptURL('listinfo', absolute=1),
+         'optionsurl'  : mlist.GetOptionsURL(sender, absolute=1),
+         }, lang=lang, mlist=mlist, raw=1)
+    # Craft the outgoing message, with all headers and attributes
+    # necessary for general delivery.  Then enqueue it to the outgoing
+    # queue.
+    subject = _('%(realname)s post acknowledgement')
+    usermsg = Message.UserNotification(sender, mlist.GetBouncesEmail(),
+                                       subject, text, lang)
+    usermsg.send(mlist)