That is still not an explanation. What do you mean by mail proxy? Do you
mean shared instead? How are the permissions set up?
Version of Outlook? Help-> About
Type of account? HTTP, POP3, IMAP, Exchange, Other?
Assuming Exchange; your boss has set her as a delegate so that means you
can't. You can ask your boss if she has also permissions to read private
items. If not; you can set the sensitivity of your e-mail to private. If she
has that permission ask your boss on how to he wants to be contacted him
about private issues without informing his delegates.