Hello,
I have a Dovecot 2.2.22 configured with mdbox storage.
THe server have about 50 mailboxes configured.
Only in one mailbox I have a strange problem, sometime (in the last 2
month happens 3 times).
All the mail (Except INBOX) and all folders disappear.
THe space on disk remain allocated.
To this mailbox are connected 3 computers (2 PC Windows 10, and 1 Mac OS).
I cannot determine who and why this happens to this mailbox.
Can someone tellme how I can find the PC that delete all mail.
mail_log plugin is your friend. See https://doc.dovecot.org/plugin-settings/maillog/