Re: I for once, love Skype.
"I even got a classified email from the US once."
Similar here. I got a few emails emails from ITV with me CC'd in discussing an upcoming production. It took about three weeks of replying to them pointing out the mistake before I eventually did a Reply-All and it stopped (also got an apology for the inconvenience, natch!)
Another one was a company sending me details of a contract workers invoices/expenses. That only happened once and they were *extremely* apologetic and thanked me profusely for pointing it out to them. That could have been very nasty for them.