> Deleting email can sometimes be construed as destruction of evidence. And having email can sometimes win you court cases.

We have annual training on PIPA and FOI (Canada) and it's stressed any e-mail, written notes or any form of recording are fair game for anyone to request seeing. Even blank lines on a notepad should have a line and initialed, all pages should be numbered sequentially.

You can destroy notes and delete e-mail in fact it's probably a good idea since the less ammunition there is the safer you are.