I would be surprised if it was a scam even if I think it's totally unprofessional and a badly tought through mailshot.@ClubMan you have no reason to believe it is genuine, your only argument has been that it was sent to anyone who has an Etrade account.
There are plenty of scam indicators, some of which I listed earlier
Somebody would have had to obtain my name, address and last 4 digits of my E*Trade account and then send me a badly formatted brochure that doesn't actually obviously solicit anything from me.
So even if it was a scam, it would be a really poor attempt at one.