Please be advised that from 12th of February 2016 email address type n.surname@liugongpl.com in no longer in use. Therefore I kindly ask all customers and contractors to change all old email addresses. At the same time, please note that valid email addresses to person who works at ZZN Transmission are  as follows: n.surname@zzn-transmissiosns.com and name.surname@dressta.com . If somebody send a message to no longer used email address will receive feedback as below: Mail Delivery System mailer-daemon@home.pl <n.surname@liugongpl.com>: 550 5.1.1 User not found – no such address.