So If people are stupid indeed they will be using the company email service to send corporate secret...
Are the people behind this law stupid (...like a fox)?
Second point, are they, as well, going to monitor emails send through google Gmail, Yahoo mail, hotmail etc...? are they going to ban employees access to those email providers from internet access?
if they really want to protect corporate secret then they will need to :
1-forbid any internet access
2-remove any cd/disk drive
3-remove any USB port
5-disallow the use of mobile phone or digital camera
6-body check each person when they finnish their work
7-check people social connections, monitor phone calls
Then maybe corporate secret won't go to the "evil" competitor.