Add three new rules and their associated doctests.

- A rule that checks to see if the sender is a moderated member.
- A rule that checks to see if the sender is a non-member.
- A rule that checks to see if the message has no (or an empty) Subject.

Give IMembers (and the associated database implementation) an `is_moderated`
flag.

1 files changed, 3 insertions, 0 deletions

diff --git a/Mailman/interfaces/member.py b/Mailman/interfaces/member.py
index 18f0b034e..8fc410a77 100644
--- a/Mailman/interfaces/member.py
+++ b/Mailman/interfaces/member.py
@@ -78,6 +78,9 @@ class IMember(Interface):
     role = Attribute(
         """The role of this membership.""")
 
+    is_moderated = Attribute(
+        """True if the membership is moderated, otherwise False.""")
+
     def unsubscribe():
         """Unsubscribe (and delete) this member from the mailing list."""