diff --git a/src/applications/mailinglists/storage/PhabricatorMetaMTAMailingList.php b/src/applications/mailinglists/storage/PhabricatorMetaMTAMailingList.php
--- a/src/applications/mailinglists/storage/PhabricatorMetaMTAMailingList.php
+++ b/src/applications/mailinglists/storage/PhabricatorMetaMTAMailingList.php
@@ -51,7 +51,7 @@
   }
 
   public function getPolicy($capability) {
-    return PhabricatorPolicies::POLICY_USER;
+    return PhabricatorPolicies::getMostOpenPolicy();
   }
 
   public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {