2 files changed, 41 insertions, 0 deletions
diff --git a/src/mailman/interfaces/configuration.py b/src/mailman/interfaces/configuration.py
index 2a9369fd1..7cee9972a 100644
--- a/src/mailman/interfaces/configuration.py
+++ b/src/mailman/interfaces/configuration.py
@@ -31,6 +31,15 @@ class MissingConfigurationFileError(MailmanError):
 
 
 @public
+class InvalidConfigurationError(MailmanError):
+    """A configuration key had an unexpected/invalid value."""
+
+    def __init__(self, key, value):
+        self.key = key
+        self.value = value
+
+
+@public
 class IConfiguration(Interface):
     """Marker interface; used for adaptation in the REST API."""
 
diff --git a/src/mailman/interfaces/smtp.py b/src/mailman/interfaces/smtp.py
new file mode 100644
index 000000000..477152621
--- /dev/null
+++ b/src/mailman/interfaces/smtp.py
@@ -0,0 +1,32 @@
+# Copyright (C) 2009-2017 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/>.
+
+"""Interface for a SMTP connection."""
+
+from public import public
+from zope.interface import Interface
+
+
+@public
+class ISMTPConnection(Interface):
+    """A SMTP connection. Like smtplib.SMTP."""
+
+    def sendmail(self, envsender, recipients, msgtext):
+        """Mimic `smtplib.SMTP.sendmail`."""
+
+    def quit(self):
+        """Mimic `smtplib.SMTP.quit`."""