1 files changed, 45 insertions, 0 deletions
diff --git a/src/mailman/rules/no_senders.py b/src/mailman/rules/no_senders.py
new file mode 100644
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+++ b/src/mailman/rules/no_senders.py
@@ -0,0 +1,45 @@
+# Copyright (C) 2007-2017 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/>.
+
+"""Membership related rules."""
+
+from mailman.core.i18n import _
+from mailman.interfaces.rules import IRule
+from public import public
+from zope.interface import implementer
+
+
+@public
+@implementer(IRule)
+class NoSenders:
+    """The message has no senders rule."""
+
+    name = 'no-senders'
+    description = _('Match messages with no valid senders.')
+    record = True
+
+    def check(self, mlist, msg, msgdata):
+        """See `IRule`."""
+        if msg.sender:
+            return False
+        else:
+            msgdata['moderation_action'] = 'discard'
+            msgdata['moderation_sender'] = _('None')
+            msgdata.setdefault('moderation_reasons', []).append(
+                # This will get translated at the point of use.
+                'The message has no valid senders')
+            return True