Same as 419. This has been ongoing for 2 years. I have actually accused them of selling email addresses. Back comes the standard 'you must have sent emails' or ' you must have been in chat' or a host of others. NO. A totally DORMANT email address gets spammed. Try reporting them to a trading standards organisation. I cannot think of any other reason. Odd thing is that my main username gets spammed most. Logic says that if the stuff is random generated all will get the same? My main name has never sent out either.
They need to try harder!