[Dovecot] Save sent mail on server

Hi dovecot list users,

currently we have some email accounts which get maintained by different people. If any of this users sends a mail, it is only saved on his local machine, but not on the imap server. But i'll need them to get saved on the mail server for backup purposes and that every user can see which mails have been sent through this account. Is this possible?

Thanks in advance Regards Benjamin