piano, if you really want to find out if the email is valid or not is to contact the person directly through your email and include a copy of what it posted here. The email addy is listed there so you know who to contact, or contact someone else via their website. They can then tell you if that email is valid or not since it is recent as of today.
As for the to, too, two inregards to the too, I have seen my word proccessors for Word and Outlook express sometimes misuse the wrong at times, or even put in a different word for what I thought I wanted. I am not saying I fully agree with you, but do see what you are saying. I am just expressing a possibility on what may have happened.