we would like to prevent normal users to delete mails in the "sent-mailbox".

(we are not yet sure whether all users of a workgroup should use the same
user-account/password or if we are going to implement a "shared mbox environment")

Thank's a lot for any feedback!


Of corse we had a look a ZAD which would probably solve that problem, but
Zimbra Archiving&Discovery it's not cheap and - even more important -
does not yet offer all features we are looking for.