diff --git a/application/src/main/java/org/thingsboard/server/service/mail/DefaultMailService.java b/application/src/main/java/org/thingsboard/server/service/mail/DefaultMailService.java
index d80b3b719f..d4c0decf3e 100644
--- a/application/src/main/java/org/thingsboard/server/service/mail/DefaultMailService.java
+++ b/application/src/main/java/org/thingsboard/server/service/mail/DefaultMailService.java
@@ -15,34 +15,31 @@
  */
 package org.thingsboard.server.service.mail;
 
-import java.util.HashMap;
-import java.util.Locale;
-import java.util.Map;
-import java.util.Properties;
-
-import javax.annotation.PostConstruct;
-import javax.mail.internet.MimeMessage;
-
+import com.fasterxml.jackson.databind.JsonNode;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.velocity.app.VelocityEngine;
-import org.springframework.beans.factory.annotation.Qualifier;
-import org.thingsboard.server.exception.ThingsboardErrorCode;
-import org.thingsboard.server.exception.ThingsboardException;
-import org.thingsboard.server.common.data.AdminSettings;
-import org.thingsboard.server.dao.settings.AdminSettingsService;
-import org.thingsboard.server.dao.exception.IncorrectParameterException;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.MessageSource;
 import org.springframework.core.NestedRuntimeException;
 import org.springframework.mail.javamail.JavaMailSenderImpl;
 import org.springframework.mail.javamail.MimeMessageHelper;
 import org.springframework.stereotype.Service;
 import org.springframework.ui.velocity.VelocityEngineUtils;
+import org.thingsboard.server.common.data.AdminSettings;
+import org.thingsboard.server.dao.exception.IncorrectParameterException;
+import org.thingsboard.server.dao.settings.AdminSettingsService;
+import org.thingsboard.server.exception.ThingsboardErrorCode;
+import org.thingsboard.server.exception.ThingsboardException;
+
+import javax.annotation.PostConstruct;
+import javax.mail.internet.MimeMessage;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Properties;
 
-import com.fasterxml.jackson.databind.JsonNode;
 @Service
 @Slf4j
 public class DefaultMailService implements MailService {
diff --git a/pom.xml b/pom.xml
index 3bdacd3ebd..dec1e441ef 100755
--- a/pom.xml
+++ b/pom.xml
@@ -480,6 +480,10 @@
                         <groupId>javax.servlet</groupId>
                         <artifactId>servlet-api</artifactId>
                     </exclusion>
+                    <exclusion>
+                        <groupId>dom4j</groupId>
+                        <artifactId>dom4j</artifactId>
+                    </exclusion>
                 </exclusions>
             </dependency>
             <dependency>