There is a mail server running Mailcow that I would like to decommission all but a few mailboxes (spring cleaning, but also spam issue), i.e. indicate to mail senders that the addresses are nonexistent. Is there a way to do this but also continue to retain copies of letters received in some form? Alternatively, maybe there’s a way to enable the catchall address but not indicate that the mailboxes exist for a similar result?