diff --git a/core/admin/mailu/configuration.py b/core/admin/mailu/configuration.py
index 7dcd7c3a..66b0b832 100644
--- a/core/admin/mailu/configuration.py
+++ b/core/admin/mailu/configuration.py
@@ -67,6 +67,7 @@ DEFAULT_CONFIG = {
     'HOST_REDIS': 'redis',
     'HOST_FRONT': 'front',
     'SUBNET': '192.168.203.0/24',
+    'SUBNET6': None,
     'POD_ADDRESS_RANGE': None
 }
 
diff --git a/core/admin/mailu/internal/views/dovecot.py b/core/admin/mailu/internal/views/dovecot.py
index f44f59bc..9c665977 100644
--- a/core/admin/mailu/internal/views/dovecot.py
+++ b/core/admin/mailu/internal/views/dovecot.py
@@ -11,6 +11,8 @@ def dovecot_passdb_dict(user_email):
     user = models.User.query.get(user_email) or flask.abort(404)
     allow_nets = []
     allow_nets.append(app.config["SUBNET"])
+    if app.config["SUBNET6"]:
+        allow_nets.append(app.config["SUBNET6"])
     if app.config["POD_ADDRESS_RANGE"]:
         allow_nets.append(app.config["POD_ADDRESS_RANGE"])
     return flask.jsonify({