Are personal messages protected by copyright?

There's a cool thread going now regarding the above-captioned.

I got bitten by a similar issue here on E2. Now, I wasn't in any copyright violation, but it was the expectation of privacy that I was accused of violating.

I received a message via our /msg system that I thought was abusive. I then published that message in a daylog. I got fired as a CE. The reason cited was that the sender of the abusive /msg to me, although he did not request it in his /msg, expected that the contents of that message were confidential and only between us. My assumption was that if someone sends me something, particularly something I find inflammatory, it's mine to broadcast to the world, along with something from me saying "did y'all see what he/she said to me?!!"

You see, the /msg was from my then-boss at E2. The current person in charge supported my removal as an editor and failed to reinstate me after the hierarchy changed (he did, kindly, entertain a review of the decision to remove me). Now, for fear of committing the same kind of violation, I can't tell you what was in the /msg giving me the rationale for keeping me out of the editorial staff here.

/rant off.