This spam email came through disguised as coming from the US Treasury. It sounds pretty serious, but this is just something else to clutter your mailbox.
We have all heard about the infamous "Nigerian Prince" by now as an internet legend. This email is no different in its attempt to gain a response from you. While you may think responding–even with false information–may be funny, they have now confirmed your account exists and is active. They will further target your mailbox with more spam. The best thing to do is to never respond.
Please report any suspicious emails to email@example.com