Ban on deleting incoming emails?

Question

IMAP

There is a Zimbra server, you need to create 1 shared mailbox without the ability to delete incoming messages.
I thought about setting up forwarding to other mailboxes, that is, creating 1 general one and from there forwarding to others, but it is necessary that some users have access to send letters from a common account ... Share your experience, gentlemen, how can all this be implemented?