1 files changed, 6 insertions, 0 deletions

diff --git a/src/mailman/interfaces/mailinglist.py b/src/mailman/interfaces/mailinglist.py
index a3e6e443a..843430caf 100644
--- a/src/mailman/interfaces/mailinglist.py
+++ b/src/mailman/interfaces/mailinglist.py
@@ -423,6 +423,12 @@ class IMailingList(Interface):
         Filtering is performed on MIME type and file name extension.
         """)
 
+    filter_action = Attribute(
+        """Action to take when the top-level content-type is filtered.
+
+        The value is a `FilterAction` enum.
+        """)
+
     convert_html_to_plaintext = Attribute(
         """Flag specifying whether text/html parts should be converted.