Who owns the email?
I'd say that if it's a company email account then I'd expect the company to have the right, especially if it was announced up-front, to check the contents. I don't know if they actually do, but I assume my employer does, which is why I don't use my company email account for things I'd much rather they didn't know.
If I was going to leak things to external parties I wouldn't email it, I'd most likely use a USB key or SD card, especially as they've thoughtfully provided us with laptops that handle SD cards. Or I'd just have it on the laptop and copy to another network using wireless. So many ways that are hard to monitor (unless you've got a really good and solid IT setup), why use the one they can spot?


