=== modified file 'src/mailman/model/usermanager.py'
--- src/mailman/model/usermanager.py	2015-02-06 03:04:45 +0000
+++ src/mailman/model/usermanager.py	2015-03-20 13:41:37 +0000
@@ -49,6 +49,7 @@
     @dbconnection
     def delete_user(self, store, user):
         """See `IUserManager`."""
+        store.delete(user.preferences)
         store.delete(user)
 
     @dbconnection

=== modified file 'src/mailman/rest/tests/test_users.py'
--- src/mailman/rest/tests/test_users.py	2015-02-10 00:41:46 +0000
+++ src/mailman/rest/tests/test_users.py	2015-03-20 13:41:08 +0000
@@ -36,6 +36,7 @@
 from mailman.testing.layers import RESTLayer
 from urllib.error import HTTPError
 from zope.component import getUtility
+from mailman.model.preferences import Preferences
 
 
 
@@ -46,6 +47,24 @@
         with transaction():
             self._mlist = create_list('test@example.com')
 
+    def test_preferences_deletion_on_user_deletion(self):
+        #deleting a user should also delete her preferences
+        with transaction():
+            anne = getUtility(IUserManager).create_user(
+                'anne@example.com', 'Anne Person')
+        preferences_id=anne.preferences.id 
+        #preferences should be there in the table
+        preferences_before_deletion=config.db.store.query(Preferences).filter_by(id=preferences_id)
+        self.assertEqual(preferences_before_deletion.count(), 1)
+        #delete the user
+        content, response = call_api(
+            'http://localhost:9001/3.0/users/anne@example.com',
+            method='DELETE')
+        self.assertEqual(response.status, 204)
+        #the corresponding prefernces must no longer exist
+        preferences_after_deletion=config.db.store.query(Preferences).filter_by(id=preferences_id)
+        self.assertEqual(preferences_after_deletion.count(), 0)
+
     def test_get_missing_user_by_id(self):
         # You can't GET a missing user by user id.
         with self.assertRaises(HTTPError) as cm:

=== modified file 'src/mailman/rest/users.py'
--- src/mailman/rest/users.py	2015-02-10 00:41:46 +0000
+++ src/mailman/rest/users.py	2015-03-19 05:29:11 +0000
@@ -185,7 +185,7 @@
         return UserAddresses(self._user)
 
     def on_delete(self, request, response):
-        """Delete the named user, all her memberships, and addresses."""
+        """Delete the named user, all her memberships, addresses and preferences."""
         if self._user is None:
             not_found(response)
             return