diff --git a/certbot-postfix/certbot_postfix/installer.py b/certbot-postfix/certbot_postfix/installer.py
index 189836bbe..366824f07 100644
--- a/certbot-postfix/certbot_postfix/installer.py
+++ b/certbot-postfix/certbot_postfix/installer.py
@@ -21,7 +21,7 @@ logger = logging.getLogger(__name__)
 
 @zope.interface.implementer(interfaces.IInstaller)
 @zope.interface.provider(interfaces.IPluginFactory)
-class Installer(plugins_common.Plugin):
+class Installer(plugins_common.Installer):
     """Certbot installer plugin for Postfix."""
 
     description = "Configure TLS with the Postfix MTA"
@@ -278,24 +278,6 @@ class Installer(plugins_common.Plugin):
         """
         self.maybe_add_config_lines()
 
-    def rollback_checkpoints(self, rollback=1):
-        """Revert `rollback` number of configuration checkpoints.
-        :raises .PluginError: when configuration cannot be fully reverted
-        """
-
-    def recovery_routine(self):
-        """Revert configuration to most recent finalized checkpoint.
-        Remove all changes (temporary and permanent) that have not been
-        finalized. This is useful to protect against crashes and other
-        execution interruptions.
-        :raises .errors.PluginError: If unable to recover the configuration
-        """
-
-    def view_config_changes(self):
-        """Display all of the LE config changes.
-        :raises .PluginError: when config changes cannot be parsed
-        """
-
     def config_test(self):
         """Make sure the configuration is valid.
         :raises .MisconfigurationError: when the config is not in a usable state
diff --git a/certbot-postfix/certbot_postfix/installer_test.py b/certbot-postfix/certbot_postfix/installer_test.py
index 1796c60ca..547a954e2 100644
--- a/certbot-postfix/certbot_postfix/installer_test.py
+++ b/certbot-postfix/certbot_postfix/installer_test.py
@@ -24,12 +24,12 @@ myhostname = mail.fubard.org
 myorigin = fubard.org"""
 
 
-class InstallerTest(certbot_test_util.TempDirTestCase):
+class InstallerTest(certbot_test_util.ConfigTestCase):
 
     def setUp(self):
         super(InstallerTest, self).setUp()
-        self.config = mock.MagicMock(postfix_config_dir=self.tempdir,
-                                     postfix_config_utility="postconf")
+        self.config.postfix_config_dir = self.tempdir
+        self.config.postfix_config_utility = "postconf"
 
     def test_add_parser_arguments(self):
         mock_add = mock.MagicMock()