Maybe the person who's email address has been used is a secret benefactor planning to pay for everyone's Flyer Club membership going forward!
On a mildly related note (incorrect email addresses), I constantly get other people's emails thanks to Google ignoring dots in addresses. Lots of people don't realise that "joe.bloggs" at gmail.com, "joebloggs", "j.o.e.bloggs", etc all go to the same place. I have a namesake in Australia who seems incapable of giving people the right email address, apparently he had new air conditioning installed recently and his son is doing very well in the school rugby team. I have another namesake who is a member of a very expensive golf club in Virginia Water, recently test drove an Aston Martin DB11 and has expressed interest in a DBX. How the other half live!