diff --git a/roles/mailu-docker/files/mailu/overrides/rspamd/dkim_signing.conf b/roles/mailu-docker/files/mailu/overrides/rspamd/dkim_signing.conf
new file mode 100644
index 0000000..1dbc9fe
--- /dev/null
+++ b/roles/mailu-docker/files/mailu/overrides/rspamd/dkim_signing.conf
@@ -0,0 +1,2 @@
+allow_username_mismatch = true;
+