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diff --git a/mailman/pipeline/replybot.py b/mailman/pipeline/replybot.py
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+# Copyright (C) 1998-2008 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.
+
+"""Handler for auto-responses."""
+
+__metaclass__ = type
+__all__ = ['Replybot']
+
+
+import time
+import logging
+import datetime
+
+from string import Template
+from zope.interface import implements
+
+from mailman import Message
+from mailman import Utils
+from mailman.i18n import _
+from mailman.interfaces import IHandler
+
+
+log = logging.getLogger('mailman.error')
+NODELTA = datetime.timedelta()
+
+
+
+def process(mlist, msg, msgdata):
+    # Normally, the replybot should get a shot at this message, but there are
+    # some important short-circuits, mostly to suppress 'bot storms, at least
+    # for well behaved email bots (there are other governors for misbehaving
+    # 'bots).  First, if the original message has an "X-Ack: No" header, we
+    # skip the replybot.  Then, if the message has a Precedence header with
+    # values bulk, junk, or list, and there's no explicit "X-Ack: yes" header,
+    # we short-circuit.  Finally, if the message metadata has a true 'noack'
+    # key, then we skip the replybot too.
+    ack = msg.get('x-ack', '').lower()
+    if ack == 'no' or msgdata.get('noack'):
+        return
+    precedence = msg.get('precedence', '').lower()
+    if ack <> 'yes' and precedence in ('bulk', 'junk', 'list'):
+        return
+    # Check to see if the list is even configured to autorespond to this email
+    # message.  Note: the mailowner script sets the `toadmin' or `toowner' key
+    # (which for replybot purposes are equivalent), and the mailcmd script
+    # sets the `torequest' key.
+    toadmin = msgdata.get('toowner')
+    torequest = msgdata.get('torequest')
+    if ((toadmin and not mlist.autorespond_admin) or
+           (torequest and not mlist.autorespond_requests) or \
+           (not toadmin and not torequest and not mlist.autorespond_postings)):
+        return
+    # Now see if we're in the grace period for this sender.  graceperiod <= 0
+    # means always autorespond, as does an "X-Ack: yes" header (useful for
+    # debugging).
+    sender = msg.get_sender()
+    now = time.time()
+    graceperiod = mlist.autoresponse_graceperiod
+    if graceperiod > NODELTA and ack <> 'yes':
+        if toadmin:
+            quiet_until = mlist.admin_responses.get(sender, 0)
+        elif torequest:
+            quiet_until = mlist.request_responses.get(sender, 0)
+        else:
+            quiet_until = mlist.postings_responses.get(sender, 0)
+        if quiet_until > now:
+            return
+    # Okay, we know we're going to auto-respond to this sender, craft the
+    # message, send it, and update the database.
+    realname = mlist.real_name
+    subject = _(
+        'Auto-response for your message to the "$realname" mailing list')
+    # Do string interpolation into the autoresponse text
+    d = dict(listname       = realname,
+             listurl        = mlist.script_url('listinfo'),
+             requestemail   = mlist.request_address,
+             owneremail     = mlist.owner_address,
+             )
+    if toadmin:
+        rtext = mlist.autoresponse_admin_text
+    elif torequest:
+        rtext = mlist.autoresponse_request_text
+    else:
+        rtext = mlist.autoresponse_postings_text
+    # Interpolation and Wrap the response text.
+    text = Utils.wrap(Template(rtext).safe_substitute(d))
+    outmsg = Message.UserNotification(sender, mlist.bounces_address,
+                                      subject, text, mlist.preferred_language)
+    outmsg['X-Mailer'] = _('The Mailman Replybot')
+    # prevent recursions and mail loops!
+    outmsg['X-Ack'] = 'No'
+    outmsg.send(mlist)
+    # update the grace period database
+    if graceperiod > NODELTA:
+        # graceperiod is in days, we need # of seconds
+        quiet_until = now + graceperiod * 24 * 60 * 60
+        if toadmin:
+            mlist.admin_responses[sender] = quiet_until
+        elif torequest:
+            mlist.request_responses[sender] = quiet_until
+        else:
+            mlist.postings_responses[sender] = quiet_until
+
+
+
+class Replybot:
+    """Send automatic responses."""
+
+    implements(IHandler)
+
+    name = 'replybot'
+    description = _('Send automatic responses.')
+
+    def process(self, mlist, msg, msgdata):
+        """See `IHandler`."""
+        process(mlist, msg, msgdata)