E-mails & Personnel info

Has anyone had a negative experience with managers using e-mail to discuss personnel issues? Our computer network has all the necessary security it needs. But, is it wise to share personnel information/issues via e-mail. Do you discuss performance, wages, other issues with a manager/director regarding an employee under their supervision using e-mail as the means of communicating?
Comments
Face it. If you have a good IT department, e-mails and other computer records are secure to almost every except that IT person/department. You need to make sure that the IT person/department understands the consequences of snooping into files that they shouldn't.
We do trust out IT people, and we do send confidential information by e-mail internally. We can not guarantee it is secure outside of the company, so if you do that, then you are taking chances.
Rob
Rob