diff --git a/mailbox/.clang-format b/mailbox/.clang-format
new file mode 100644
index 0000000..e45a760
--- /dev/null
+++ b/mailbox/.clang-format
@@ -0,0 +1,23 @@
+#
+# Copyright (c) 2019-2020 Arm Limited. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the License); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an AS IS BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+---
+Language: Cpp
+SortIncludes: false
+DisableFormat: true
+---