"Though it seems impossible to imagine the unwanted e-mail known as spam as anything but a nuisance, there is something creative about these return addresses - even if they are being used for untoward purposes." Lisa Napoli in the New York Times on the new gimmick spammers are using: improbable sender names*.
Looking for some legit names to use in your fiction? Found in the article above, these links to name generators. Also this one, which "merges names from the worlds of Harry Potter and of Dickens."