Fuentes:
How to delete all or some emails from a mailbox without logging in to the mailbox on a Plesk server?
https://support.plesk.com/hc/en-us/articles/12377454616343-How-to-delete-all-or-some-emails-from-a-mailbox-without-logging-in-to-the-mailbox-on-a-Plesk-server-
Remove all messages older than a week from the ‘Inbox’ folder for the particular mailbox user@example.com:
doveadm expunge -u user@example.com mailbox ‘*’ before 1w
Get the information about existing mailboxes:
# doveadm mailbox list -u user@example.com
INBOX
INBOX.Spam
INBOX.Drafts
INBOX.Trash
INBOX.Sent
