There are lots of people out there who aren't as astute as you and I on matters such as these. I once key-worked a guy who had been diagnosed with an IQ of 85 and was on benefits and spent about £400 in a night chatting up a girl on a premium line unaware he was being charged at exorbitant rates. BTW he was the best chess player I've ever seen though.
Jock1e are you saying you would like Virgin media or any other ISP you may be with to read all of your emails just to find the ones that could be a scam on the other hand they could also be personal documents for you to read.
I suppose some people might think they are going to find out some salacious information. But, I come back to this, anyone daft enough to fall for this would jump at a tax refund or a Nigerian princess or all the other scams.
Incidentally, I looked at the company named in my email. It seems to be perfectly normal and has just been picked from the phonebook.