diff --git a/application/src/test/java/org/thingsboard/server/service/mail/TbMailSenderTest.java b/application/src/test/java/org/thingsboard/server/service/mail/TbMailSenderTest.java
index 9beb8a4dd8..81cfea1d35 100644
--- a/application/src/test/java/org/thingsboard/server/service/mail/TbMailSenderTest.java
+++ b/application/src/test/java/org/thingsboard/server/service/mail/TbMailSenderTest.java
@@ -1,3 +1,18 @@
+/**
+ * Copyright © 2016-2023 The Thingsboard Authors
+ *
+ * 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
+ *
+ *     http://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.
+ */
 package org.thingsboard.server.service.mail;
 
 import com.fasterxml.jackson.databind.node.ObjectNode;