I just got an email with this subject from the National Lottery because I bought a ticket online for last night. The body of the email said:
We have some exciting news about the ticket that you bought for the Saturday 26 January draw. Please Sign In to your Account at the National Lottery website for more details.
Interactive Customer Care
So I got all excited (it was a triple rollover after all). Turns out I've won a tenner. I'm not complaining but couldn't they have told me that in the email? Something along the lines of "You've won something, don't get too excited though."