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diff --git a/contrib/gunicorn.py b/contrib/gunicorn.py
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+++ b/contrib/gunicorn.py
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+# Copyright (C) 2015-2017 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/>.
+
+"""Experimental Gunicorn based REST server.
+
+To use this do the following:
+
+* Install gunicorn as a Python 3 application (in a venv if necessary).
+* Copy this file into your Python's site-packages under the name mmgunicorn.py
+* Create a mailman.cfg with at least the following in it:
+
+  [runner.rest]
+  start: no
+
+* Start Mailman as normal: `mailman start`
+* Set the MAILMAN_CONFIG_FILE environment variable to the location of your
+  mailman.cfg file from above.
+* Run: gunicorn mmgunicorn:run
+"""
+
+from public import public
+
+
+_initialized = False
+
+
+@public
+def run(environ, start_response):
+    """Create the WSGI application.
+
+    Use this if you want to integrate Mailman's REST server with an external
+    WSGI server, such as gunicorn.  Be sure to set the $MAILMAN_CONFIG_FILE
+    environment variable.
+    """
+    # Imports are here to evaluate them lazily, prevent circular imports, and
+    # make flake8 happy.
+    global _initialized
+    if not _initialized:
+        from mailman.core.initialize import initialize
+        # First things first, initialize the system before any other imports or
+        # other operations.  It must only be initialized once though.
+        initialize(propagate_logs=True)
+        _initialized = True
+    # Hook things up to WSGI.
+    from mailman.rest.wsgiapp import make_application
+    app = make_application()
+    return app(environ, start_response)