diff --git a/core/admin/mailu/internal/views/rspamd.py b/core/admin/mailu/internal/views/rspamd.py
index 4b17297a..a513a113 100644
--- a/core/admin/mailu/internal/views/rspamd.py
+++ b/core/admin/mailu/internal/views/rspamd.py
@@ -2,6 +2,7 @@ from mailu import models
 from mailu.internal import internal
 
 import flask
+import idna
 
 def vault_error(*messages, status=404):
     return flask.make_response(flask.jsonify({'errors':messages}), status)
@@ -19,7 +20,7 @@ def rspamd_dkim_key(domain_name):
         if key := domain.dkim_key:
             selectors.append(
                 {
-                    'domain'  : domain.name,
+                    'domain'  : idna.encode(domain.name.lower()).decode('ascii'),
                     'key'     : key.decode('utf8'),
                     'selector': flask.current_app.config.get('DKIM_SELECTOR', 'dkim'),
                 }
@@ -28,7 +29,7 @@ def rspamd_dkim_key(domain_name):
         if key := domain.domain.dkim_key:
             selectors.append(
                 {
-                    'domain'  : domain.name,
+                    'domain'  : idna.encode(domain.name.lower()).decode('ascii'),
                     'key'     : key.decode('utf8'),
                     'selector': flask.current_app.config.get('DKIM_SELECTOR', 'dkim'),
                 }