diff --git a/modoboa/core/management/commands/add_allowed_hosts.py b/modoboa/core/management/commands/add_allowed_hosts.py
new file mode 100644
index 000000000..90463ccc4
--- /dev/null
+++ b/modoboa/core/management/commands/add_allowed_hosts.py
@@ -0,0 +1,33 @@
+from django.core.management.base import BaseCommand, CommandError
+
+from oauth2_provider.models import get_application_model
+
+
+class Command(BaseCommand):
+    """Command class."""
+
+    help = "Add new allowed hosts to frontend Oauth2 application."
+
+    def add_arguments(self, parser):
+        parser.add_argument("hostnames", type=str, nargs="+")
+
+    def handle(self, *args, **options):
+        app_model = get_application_model()
+        app = app_model.objects.filter(name="modoboa_frontend").first()
+        if not app:
+            raise CommandError(
+                "Application modoboa_frontend not found. "
+                "Make sure you ran load_initial_data first."
+            )
+        redirect_uris = app.redirect_uris.split(" ")
+        post_logout_redirect_uris = app.post_logout_redirect_uris.split(" ")
+        for hostname in options["hostnames"]:
+            uri = f"https://{hostname}/login/logged"
+            if uri not in redirect_uris:
+                redirect_uris.append(uri)
+            uri = f"https://{hostname}"
+            if uri not in post_logout_redirect_uris:
+                post_logout_redirect_uris.append(uri)
+        app.redirect_uris = " ".join(redirect_uris)
+        app.post_logout_redirect_uris = " ".join(post_logout_redirect_uris)
+        app.save()
diff --git a/modoboa/core/tests/test_core.py b/modoboa/core/tests/test_core.py
index 77cec3457..99a448ebb 100644
--- a/modoboa/core/tests/test_core.py
+++ b/modoboa/core/tests/test_core.py
@@ -186,6 +186,30 @@ class ManagementCommandsTestCase(SimpleModoTestCase):
         with self.assertRaises(models.User.DoesNotExist):
             account.refresh_from_db()
 
+    def test_add_allowed_hosts(self):
+        with self.assertRaises(management.CommandError):
+            management.call_command(
+                "add_allowed_hosts", "app1.domain.tld", "app2.domain.tld"
+            )
+        management.call_command("load_initial_data")
+        management.call_command(
+            "add_allowed_hosts", "app1.domain.tld", "app2.domain.tld"
+        )
+        app_model = get_application_model()
+        app = app_model.objects.filter(name="modoboa_frontend").first()
+        self.assertIn("app1.domain.tld", app.redirect_uris)
+        self.assertIn("app2.domain.tld", app.redirect_uris)
+        self.assertIn("app1.domain.tld", app.post_logout_redirect_uris)
+        self.assertIn("app2.domain.tld", app.post_logout_redirect_uris)
+
+        # Check if same hostname is not added more than once
+        uri_count = len(app.redirect_uris.split(" "))
+        management.call_command(
+            "add_allowed_hosts", "app1.domain.tld", "app2.domain.tld"
+        )
+        app.refresh_from_db()
+        self.assertEqual(len(app.redirect_uris.split(" ")), uri_count)
+
 
 class APICommunicationTestCase(ModoTestCase):
     """Check communication with the API."""