I didn't know the envelope in the upper right corner was the mailbox. I thought, at first, it was a link to send emails to the admins. I clicked on it out of curiosity and saw the mailbox. It might be better if you had the word "mailbox" somewhere on the page.
I'll have to get used to this new layout.
EDIT: In reading through other responses, some others can't find the mailbox, either. I'm guessing the mailbox function will be fixed, soon.
Success is never final; failure is never fatal. It's courage that counts.--John Wooden (1910-2010)
Courage is being scared to death, but saddling up anyway.--John Wayne (1907-1979)