How to forward a copy of mail to another email address

Hi ,

We have a domino running 2 domains, the second one is a new domain and is hardly used. so the users in the first domain has requested to send a notification or a copy of the mail coming to their 2nd domain address to their 1st domain address

i want to send a copy of mail coming in one domain to another … how can i do this to each mail box

Subject: Modify the person document

In the second domain, open the person document for this person and in the Forwarding Address enter the name or e-mail address of the person in the first domain.