E-mail monitoring in workplace is becoming a worldwide problem now.Both employers and employees have legitimate but conflicting interests toward e-mail monitoring.In Europe,individual data and e-mail privacy of employees are protected well relatively.We can learn from it.What is most important is to balance the employers' management right and employees' right to privacy.Proportional principle should be followed,which means that monitoring can't be omniscient and employees can use pure personal e-mails not related to work reasonably,even in workplace and in office hours.