A company and its senior staff, as CEO should not read the e-mail traffic of their employees and not let their email account open.
I have been approached by a client that is on this fact. It has the feeling, that their manager is reading. It's just a vague feeling, but sometimes hints are there in his statements to her life, where they do, that she has not told in this direction. She now has the opportunity to speak directly to their superiors on it or find out about the IT, whether their suspicion is confirmed. For even the IT managers, if he knows about it, is punishable by law with this action.
I know of cases, where e-mails employees were tapping and also e-mail accounts of employees, the sick or. were on maternity leave were easily opened. All illegal! It says nothing about an employee from, if he flirts with another employee, or sexual desires which he / she entertains or what practices would be tried. All illegal! And if people bad at talking about their superiors and colleagues, that is one of them and has proven cleansing power.
The work and performance must take priority and if that does not fit, then it is necessary to change something. Because everything else is illegal.