server email

If you send an e-mail on a mail server of the company is not at work, such as MSN, for example, your employer can read?
eg your company provides business opportunities, but the use of MSN or Hotmail personsal for use at work. your employer can see his email from MSN, for example? The result is that prospects can read, but what other mail sent through other servers e-mail?
They can read emails if they wish - as if to control Internet traffic inside and outside your network. You can also enter their cache and look what you made. I do not think many companies do, but I'm sure some do.