diff --git a/mailadmin/api.py b/mailadmin/api.py
index 2d228fd..0c96dbf 100644
--- a/mailadmin/api.py
+++ b/mailadmin/api.py
@@ -75,7 +75,7 @@ class DjangoPostfixDovecotAPI(object):
         """
         params = {
             'domain__name': settings.NEUF_EMAIL_DOMAIN_NAME,
-            'source_regex': regex
+            'source__iregex': regex
         }
         return self._api(
             'GET',