1 files changed, 25 insertions, 3 deletions

diff --git a/src/mailman/interfaces/mta.py b/src/mailman/interfaces/mta.py
index a8c794750..3dd1793e5 100644
--- a/src/mailman/interfaces/mta.py
+++ b/src/mailman/interfaces/mta.py
@@ -21,7 +21,8 @@ from __future__ import absolute_import, unicode_literals
 
 __metaclass__ = type
 __all__ = [
-    'IMailTransportAgent',
+    'IMailTransportAgentAliases',
+    'IMailTransportAgentDelivery',
     ]
 
 
@@ -29,8 +30,8 @@ from zope.interface import Interface
 
 
 
-class IMailTransportAgent(Interface):
-    """Interface to the MTA."""
+class IMailTransportAgentAliases(Interface):
+    """Interface to the MTA aliases generator."""
 
     def create(mlist):
         """Tell the MTA that the mailing list was created."""
@@ -40,3 +41,24 @@ class IMailTransportAgent(Interface):
 
     def regenerate():
         """Regenerate the full aliases file."""
+
+
+
+class IMailTransportAgentDelivery(Interface):
+    """Interface to the MTA delivery strategies."""
+
+    def deliver(mlist, msg, msgdata):
+        """Deliver a message to a mailing list's recipients.
+
+        Ordinarily the mailing list is consulted for delivery specifics,
+        however the message metadata dictionary can contain additional
+        directions to control delivery.  Specifics are left to the
+        implementation.
+
+        :param mlist: The mailing list being delivered to.
+        :type mlist: `IMailingList`
+        :param msg: The original message being delivered.
+        :type msg: `Message`
+        :param msgdata: Additional message metadata for this delivery.
+        :type msgdata: dictionary
+        """