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diff --git a/src/mailman/mta/personalized.py b/src/mailman/mta/personalized.py
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+++ b/src/mailman/mta/personalized.py
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+# Copyright (C) 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/>.
+
+"""Personalized delivery."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'PersonalizedDelivery',
+    ]
+
+
+from email.header import Header
+from email.utils import formataddr
+from zope.component import getUtility
+
+from mailman.interfaces.usermanager import IUserManager
+from mailman.mta.verp import VERPDelivery
+
+
+
+class PersonalizedDelivery(VERPDelivery):
+    """Personalize the message's To header."""
+
+    def _deliver_to_recipients(self, mlist, msg, msgdata,
+                               sender, recipients):
+        """See `BaseDelivery`."""
+        # This module only works with VERP delivery.
+        assert len(recipients) == 1, 'Single recipient is required'
+        # Try to find the real name for the recipient email address, if the
+        # address is associated with a user registered with Mailman.
+        recipient = recipients[0]
+        user_manager = getUtility(IUserManager)
+        user = user_manager.get_user(recipient)
+        if user is None:
+            msg.replace_header('To', recipient)
+        else:
+            # Convert the unicode name to an email-safe representation.
+            # Create a Header instance for the name so that it's properly
+            # encoded for email transport.
+            name = Header(user.real_name).encode()
+            msg.replace_header('To', formataddr((name, recipient)))
+        return super(PersonalizedDelivery, self)._deliver_to_recipients(
+            mlist, msg, msgdata, sender, recipients)