United Airlines Spam

I'm a United Mileage Plus member and I'm a pretty frequent flyer (I've amasedd about 50,000 miles these past three months) so I am a frequent visitor to the United site and happily receive the mailings. So, it gives me great pain to see that -- starting yesterday -- my inbox fill with spam with the unique email address I signed up with.

I'm not going to completely jump to conclusions and say that United sold the address (because I genuinely don't think they did) but I wonder how this email got discovered.

It's pretty easily solved. I'll just change the email address and direct mail to that one as junk.

I'm just saying...