[exim] copy sent emails

hello all

We have a small office and we want to collect all sent emails to an
seperate email (sent@???). So each user can read sent emails by
reciving all@???.

Is it possible? -and how can I establish a permanent copy-function for
sent emails in exim4?
The Outlook CC-Field is not a solution, because our users forget to copy
the email sometimes.


Thanks for answers

Martin