1 files changed, 16 insertions, 0 deletions
diff --git a/src/mailman/interfaces/mailinglist.py b/src/mailman/interfaces/mailinglist.py
index 23d2fadf4..f112b2a11 100644
--- a/src/mailman/interfaces/mailinglist.py
+++ b/src/mailman/interfaces/mailinglist.py
@@ -25,6 +25,7 @@ __all__ = [
     'IMailingList',
     'Personalization',
     'ReplyToMunging',
+    'SubscriptionPolicy',
     ]
 
 
@@ -53,6 +54,18 @@ class ReplyToMunging(Enum):
     explicit_header = 2
 
 
+class SubscriptionPolicy(Enum):
+    # Neither confirmation, nor moderator approval is required.
+    open = 0
+    # The user must confirm the subscription.
+    confirm = 1
+    # The moderator must approve the subscription.
+    moderate = 2
+    # The user must first confirm their subscription, and then if that is
+    # successful, the moderator must also approve it.
+    confirm_then_moderate = 3
+
+
 
 class IMailingList(Interface):
     """A mailing list."""
@@ -234,6 +247,9 @@ class IMailingList(Interface):
         deliver disabled or not, or of the type of digest they are to
         receive.""")
 
+    subscription_policy = Attribute(
+        """The policy for subscribing new members to the list.""")
+
     subscribers = Attribute(
         """An iterator over all IMembers subscribed to this list, with any
         role.