diff --git a/data/conf/postfix/allow_mailcow_local.regexp b/data/conf/postfix/allow_mailcow_local.regexp
new file mode 100644
index 000000000..0da4593ce
--- /dev/null
+++ b/data/conf/postfix/allow_mailcow_local.regexp
@@ -0,0 +1 @@
+/^(.+)@mailcow.local/       OK