Update UserServiceImpl.java

dao/src/main/java/org/thingsboard/server/dao/user/UserServiceImpl.java

@@ -192,6 +192,7 @@ public class UserServiceImpl extends AbstractEntityService implements UserServic
     @Override
     public UserCredentials requestPasswordReset(TenantId tenantId, String email) {
         log.trace("Executing requestPasswordReset email [{}]", email);
+        DataValidator.validateEmail(email);
         User user = findUserByEmail(tenantId, email);
         if (user == null) {
             throw new UsernameNotFoundException(String.format("Unable to find user by email [%s]", email));