Both my partner and I work in the same company, same building, same floor, different rooms. As such we very occasionally email each other about semi-personal things (e.g., What time are you planning on leaving?, Have you been for your lunch yet?, Do you want to come to the pub later with our department?) along with more professional emails.
I work as a code monkey, he's a analytical chemist. The other day my department had been discussing impending staff departures and mentioned that somebody in my partner's team was leaving. As it was the first I'd heard of it I later sent a p.s in an email to my partner asking whether he knew that Joe Bloggs was leaving.
Later that day I got a verbal warning for sending confidential data to my partner over email. I am currently unsure whether to challenge it as I'm not sure whether I'm in the wrong or not. Do companies also generally monitor emails to this extent?
Edit: The guy was leaving due to retirement and the other team had already been made aware. Given that it was already being discussed in the open plan office I didn't think it was a confidential piece of information.
Edit: Spoke to my supervisor who has said it wasn't an official warning. He rolled his eyes and grumbled about management trying to make a point. He suggests that talking about other people is off limits within the realms of email conversations (along with the obvious of inappropriate personal conversations etc). The majority of staff here have family members/partners within the company so this must be something that crops up occasionally.