Send a copy when i recive an email

[chux]

hi, first of all sorry for my english.
Im a new admin of a private server that comes with plesk.
I dont know how to send a copy of any email when an account gets a new email....
for example, when and send an email to user1@domain.com i want that user2@domain.com gets a copy of the email... and i dont known if i can do that with plesk.
Anybody can help me?
Lot of thanks